程式師世界 >> 編程語言 >> C語言 >> 關於C語言 >> C語言函數大全(s開頭)(1)

C語言函數大全(s開頭)(1)

編輯：關於C語言

函數名: sbrk

功能: 改變數據段空間位置

用法: char *sbrk(int incr);

程序例:

#include #include int main(void) { printf("Changing allocation with sbrk()\n"); printf("Before sbrk() call: %lu bytes free\n", (unsigned long) coreleft()); sbrk(1000); printf(" After sbrk() call: %lu bytes free\n", (unsigned long) coreleft()); return 0; }

函數名: scanf

功能: 執行格式化輸入

用法: int scanf(char *format[,argument,...]);

程序例:

#include #include int main(void) { char label[20]; char name[20]; int entries = 0; int loop, age; double salary; struct Entry_struct { char name[20]; int age; float salary; } entry[20]; /* Input a label as a string of characters restricting to 20 characters */ printf("\n\nPlease enter a label for the chart: "); scanf("%20s", label); fflush(stdin); /* flush the input stream in case of bad input */ /* Input number of entries as an integer */ printf("How many entries will there be? (less than 20) "); scanf("%d", &entries); fflush(stdin); /* flush the input stream in case of bad input */ /* input a name restricting input to only letters upper or lower case */ for (loop=0;loop { printf("Entry %d\n", loop); printf(" Name : "); scanf("%[A-Za-z]", entry[loop].name); fflush(stdin); /* flush the input stream in case of bad input */ /* input an age as an integer */ printf(" Age : "); scanf("%d", &entry[loop].age); fflush(stdin); /* flush the input stream in case of bad input */ /* input a salary as a float */ printf(" Salary : "); scanf("%f", &entry[loop].salary); fflush(stdin); /* flush the input stream in case of bad input */ } /* Input a name, age and salary as a string, integer, and double */ printf("\nPlease enter your name, age and salary\n"); scanf("%20s %d %lf", name, &age, &salary); /* Print out the data that was input */ printf("\n\nTable %s\n",label); printf("Compiled by %s age %d $%15.2lf\n", name, age, salary); printf("-----------------------------------------------------\n"); for (loop=0;loop printf("%4d | %-20s | %5d | %15.2lf\n", loop + 1, entry[loop].name, entry[loop].age, entry[loop].salary); printf("-----------------------------------------------------\n"); return 0; }

函數名: searchpath

功能: 搜索DOS路徑

用法: char *searchpath(char *filename);

程序例:

#include #include int main(void) { char *p; /* Looks for TLINK and returns a pointer to the path */ p = searchpath("TLINK.EXE"); printf("Search for TLINK.EXE : %s\n", p); /* Looks for non-existent file */ p = searchpath("NOTEXIST.FIL"); printf("Search for NOTEXIST.FIL : %s\n", p); return 0; }

函數名: sector

功能: 畫並填充橢圓扇區

用法: void far sector(int x, int y, int stangle, int endangle);

程序例:

#include #include #include #include int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy, i; int stangle = 45, endangle = 135; int xrad = 100, yrad = 50; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } midx = getmaxx() / 2; midy = getmaxy() / 2; /* loop through the fill patterns */ for (i=EMPTY_FILL; i { /* set the fill style */ setfillstyle(i, getmaxcolor()); /* draw the sector slice */ sector(midx, midy, stangle, endangle, xrad, yrad); getch(); } /* clean up */ closegraph(); return 0; }

函數名: segread

功能: 讀段寄存器值

用法: void segread(struct SREGS *segtbl);

程序例:

#include #include int main(void) { struct SREGS segs; segread(&segs); printf("Current segment register settings\n\n"); printf("CS: %X DS: %X\n", segs.cs, segs.ds); printf("ES: %X SS: %X\n", segs.es, segs.ss); return 0; }

函數名: setactivepage

功能: 設置圖形輸出活動頁

用法: void far setactivepage(int pagenum);

程序例:

#include #include #include #include int main(void) { /* select a driver and mode that supports */ /* multiple pages. */ int gdriver = EGA, gmode = EGAHI, errorcode; int x, y, ht; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } x = getmaxx() / 2; y = getmaxy() / 2; ht = textheight("W"); /* select the off screen page for drawing */ setactivepage(1); /* draw a line on page #1 */ line(0, 0, getmaxx(), getmaxy()); /* output a message on page #1 */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "This is page #1:"); outtextxy(x, y+ht, "Press any key to halt:"); /* select drawing to page #0 */ setactivepage(0); /* output a message on page #0 */ outtextxy(x, y, "This is page #0."); outtextxy(x, y+ht, "Press any key to view page #1:"); getch(); /* select page #1 as the visible page */ setvisualpage(1); /* clean up */ getch(); closegraph(); return 0; }

函數名: setallpallette

功能: 按指定方式改變所有的調色板顏色

用法: void far setallpallette(struct palette, far *pallette);

程序例:

#include #include #include #include int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; struct palettetype pal; int color, maxcolor, ht; int y = 10; char msg[80]; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } maxcolor = getmaxcolor(); ht = 2 * textheight("W"); /* grab a copy of the palette */ getpalette(&pal); /* display the default palette colors */ for (color=1; color<=maxcolor; color++) { setcolor(color); sprintf(msg, "Color: %d", color); outtextxy(1, y, msg); y += ht; } /* wait for a key */ getch(); /* black out the colors one by one */ for (color=1; color<=maxcolor; color++) { setpalette(color, BLACK); getch(); } /* restore the palette colors */ setallpalette(&pal); /* clean up */ getch(); closegraph(); return 0; }

函數名: setaspectratio

功能: 設置圖形縱橫比

用法: void far setaspectratio(int xasp, int yasp);

程序例:

#include #include #include #include int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int xasp, yasp, midx, midy; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } midx = getmaxx() / 2; midy = getmaxy() / 2; setcolor(getmaxcolor()); /* get current aspect ratio settings */ getaspectratio(&xasp, &yasp); /* draw normal circle */ circle(midx, midy, 100); getch(); /* claer the screen */ cleardevice(); /* adjust the aspect for a wide circle */ setaspectratio(xasp/2, yasp); circle(midx, midy, 100); getch(); /* adjust the aspect for a narrow circle */ cleardevice(); setaspectratio(xasp, yasp/2); circle(midx, midy, 100); /* clean up */ getch(); closegraph(); return 0; }

函數名: setbkcolor

功能: 用調色板設置當前背景顏色

用法: void far setbkcolor(int color);

程序例:

#include #include #include #include int main(void) { /* select a driver and mode that supports */ /* multiple background colors. */ int gdriver = EGA, gmode = EGAHI, errorcode; int bkcol, maxcolor, x, y; char msg[80]; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } /* maximum color index supported */ maxcolor = getmaxcolor(); /* for centering text messages */ settextjustify(CENTER_TEXT, CENTER_TEXT); x = getmaxx() / 2; y = getmaxy() / 2; /* loop through the available colors */ for (bkcol=0; bkcol<=maxcolor; bkcol++) { /* clear the screen */ cleardevice(); /* select a new background color */ setbkcolor(bkcol); /* output a messsage */ if (bkcol == WHITE) setcolor(EGA_BLUE); sprintf(msg, "Background color: %d", bkcol); outtextxy(x, y, msg); getch(); } /* clean up */ closegraph(); return 0; }

函數名: setblock

功能: 修改先前已分配的DOS存儲段大小

用法: int setblock(int seg, int newsize);

程序例:

#include #include #include #include int main(void) { unsigned int size, segp; int stat; size = 64; /* (64 x 16) = 1024 bytes */ stat = allocmem(size, &segp); if (stat == -1) printf("Allocated memory at segment: %X\n", segp); else { printf("Failed: maximum number of paragraphs available is %d\n", stat); exit(1); } stat = setblock(segp, size * 2); if (stat == -1) printf("Expanded memory block at segment: %X\n", segp); else printf("Failed: maximum number of paragraphs available is %d\n", stat); freemem(segp); return 0; }

函數名: setbuf

功能: 把緩沖區與流相聯

用法: void setbuf(FILE *steam, char *buf);

程序例:

#include /* BUFSIZ is defined in stdio.h */ char outbuf[BUFSIZ]; int main(void) { /* attach a buffer to the standard output stream */ setbuf(stdout, outbuf); /* put some characters into the buffer */ puts("This is a test of buffered output.\n\n"); puts("This output will go into outbuf\n"); puts("and won't appear until the buffer\n"); puts("fills up or we flush the stream.\n"); /* flush the output buffer */ fflush(stdout); return 0; }

函數名: setcbrk

功能: 設置Control-break

用法: int setcbrk(int value);

程序例:

#include #include #include int main(void) { int break_flag; printf("Enter 0 to turn control break off\n"); printf("Enter 1 to turn control break on\n"); break_flag = getch() - 0; setcbrk(break_flag); if (getcbrk()) printf("Cntrl-brk flag is on\n"); else printf("Cntrl-brk flag is off\n"); return 0; }

函數名: setcolor

功能: 設置當前畫線顏色

用法: void far setcolor(int color);

程序例:

#include #include #include #include int main(void) { /* select a driver and mode that supports */ /* multiple drawing colors. */ int gdriver = EGA, gmode = EGAHI, errorcode; int color, maxcolor, x, y; char msg[80]; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } /* maximum color index supported */ maxcolor = getmaxcolor(); /* for centering text messages */ settextjustify(CENTER_TEXT, CENTER_TEXT); x = getmaxx() / 2; y = getmaxy() / 2; /* loop through the available colors */ for (color=1; color<=maxcolor; color++) { /* clear the screen */ cleardevice(); /* select a new background color */ setcolor(color); /* output a messsage */ sprintf(msg, "Color: %d", color); outtextxy(x, y, msg); getch(); } /* clean up */ closegraph(); return 0; }

函數名: setdate

功能: 設置DOS日期

用法: void setdate(struct date *dateblk);

程序例:

#include #include #include int main(void) { struct date reset; struct date save_date; getdate(&save_date); printf("Original date:\n"); system("date"); reset.da_year = 2001; reset.da_day = 1; reset.da_mon = 1; setdate(&reset); printf("Date after setting:\n"); system("date"); setdate(&save_date); printf("Back to original date:\n"); system("date"); return 0; }

函數名: setdisk

功能: 設置當前磁盤驅動器

用法: int setdisk(int drive);

程序例:

#include #include int main(void) { int save, disk, disks; /* save original drive */ save = getdisk(); /* print number of logic drives */ disks = setdisk(save); printf("%d logical drives on the system\n\n", disks); /* print the drive letters available */ printf("Available drives:\n"); for (disk = 0;disk < 26;++disk) { setdisk(disk); if (disk == getdisk()) printf("%c: drive is available\n", disk + 'a'); } setdisk(save); return 0; }

函數名: setdta

功能: 設置磁盤傳輸區地址

用法: void setdta(char far *dta);

程序例:

#include #include #include #include int main(void) { char line[80], far *save_dta; char buffer[256] = "SETDTA test!"; struct fcb blk; int result; /* get new file name from user */ printf("Enter a file name to create:"); gets(line); /* parse the new file name to the dta */ parsfnm(line, &blk, 1); printf("%d %s\n", blk.fcb_drive, blk.fcb_name); /* request DOS services to create file */ if (bdosptr(0x16, &blk, 0) == -1) { perror("Error creating file"); exit(1); } /* save old dta and set new dta */ save_dta = getdta(); setdta(buffer); /* write new records */ blk.fcb_recsize = 256; blk.fcb_random = 0L; result = randbwr(&blk, 1); printf("result = %d\n", result); if (!result) printf("Write OK\n"); else { perror("Disk error"); exit(1); } /* request DOS services to close the file */ if (bdosptr(0x10, &blk, 0) == -1) { perror("Error closing file"); exit(1); } /* reset the old dta */ setdta(save_dta); return 0; }

函數名: setfillpattern

功能: 選擇用戶定義的填充模式

用法: void far setfillpattern(char far *upattern, int color);

程序例:

#include #include #include #include int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int maxx, maxy; /* a user defined fill pattern */ char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00}; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } maxx = getmaxx(); maxy = getmaxy(); setcolor(getmaxcolor()); /* select a user defined fill pattern */ setfillpattern(pattern, getmaxcolor()); /* fill the screen with the pattern */ bar(0, 0, maxx, maxy); /* clean up */ getch(); closegraph(); return 0; }

函數名: setfillstyle

功能: 設置填充模式和顏色

用法: void far setfillstyle(int pattern, int color);

程序例:

#include #include #include #include #include /* the names of the fill styles supported */ char *fname[] = { "EMPTY_FILL", "SOLID_FILL", "LINE_FILL", "LTSLASH_FILL", "SLASH_FILL", "BKSLASH_FILL", "LTBKSLASH_FILL", "HATCH_FILL", "XHATCH_FILL", "INTERLEAVE_FILL", "WIDE_DOT_FILL", "CLOSE_DOT_FILL", "USER_FILL" }; int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int style, midx, midy; char stylestr[40]; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } midx = getmaxx() / 2; midy = getmaxy() / 2; for (style = EMPTY_FILL; style < USER_FILL; style++) { /* select the fill style */ setfillstyle(style, getmaxcolor()); /* convert style into a string */ strcpy(stylestr, fname[style]); /* fill a bar */ bar3d(0, 0, midx-10, midy, 0, 0); /* output a message */ outtextxy(midx, midy, stylestr); /* wait for a key */ getch(); cleardevice(); } /* clean up */ getch(); closegraph(); return 0; }

函數名: setftime

功能: 設置文件日期和時間

用法: int setftime(int handle, struct ftime *ftimep);

程序例:

#include #include #include #include int main(void) { struct ftime filet; FILE *fp; if ((fp = fopen("TEST.$$$", "w")) == NULL) { perror("Error:"); exit(1); } fprintf(fp, "testing...\n"); /* load ftime structure with new time and date */ filet.ft_tsec = 1; filet.ft_min = 1; filet.ft_hour = 1; filet.ft_day = 1; filet.ft_month = 1; filet.ft_year = 21; /* show current directory for time and date */ system("dir TEST.$$$"); /* change the time and date stamp*/ setftime(fileno(fp), &filet); /* close and remove the temporary file */ fclose(fp); system("dir TEST.$$$"); unlink("TEST.$$$"); return 0; }

函數名: setgraphbufsize

功能: 改變內部圖形緩沖區的大小

用法: unsigned far setgraphbufsize(unsigned bufsize);

程序例:

#include #include #include #include #define BUFSIZE 1000 /* internal graphics buffer size */ int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int x, y, oldsize; char msg[80]; /* set the size of the internal graphics buffer */ /* before making a call to initgraph. */ oldsize = setgraphbufsize(BUFSIZE); /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } x = getmaxx() / 2; y = getmaxy() / 2; /* output some messages */ sprintf(msg, "Graphics buffer size: %d", BUFSIZE); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, msg); sprintf(msg, "Old graphics buffer size: %d", oldsize); outtextxy(x, y+textheight("W"), msg); /* clean up */ getch(); closegraph(); return 0; }

函數名: setgraphmode

功能: 將系統設置成圖形模式且清屏

用法: void far setgraphmode(int mode);

程序例:

#include #include #include #include int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int x, y; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } x = getmaxx() / 2; y = getmaxy() / 2; /* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "Press any key to exit graphics:"); getch(); /* restore system to text mode */ restorecrtmode(); printf("We're now in text mode.\n"); printf("Press any key to return to graphics mode:"); getch(); /* return to graphics mode */ setgraphmode(getgraphmode()); /* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "We're back in graphics mode."); outtextxy(x, y+textheight("W"), "Press any key to halt:"); /* clean up */ getch(); closegraph(); return 0; }

函數名: setjmp

功能: 非局部轉移

用法: int setjmp(jmp_buf env);

程序例:

#include #include #include void subroutine(void); jmp_buf jumper; int main(void) { int value; value = setjmp(jumper); if (value != 0) { printf("Longjmp with value %d\n", value); exit(value); } printf("About to call subroutine ... \n"); subroutine(); return 0; } void subroutine(void) { longjmp(jumper,1); }

函數名: setlinestyle

功能: 設置當前畫線寬度和類型

用法: void far setlinestyle(int linestype, unsigned upattern);

程序例:

#include #include #include #include #include /* the names of the line styles supported */ char *lname[] = { "SOLID_LINE", "DOTTED_LINE", "CENTER_LINE", "DASHED_LINE", "USERBIT_LINE" }; int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int style, midx, midy, userpat; char stylestr[40]; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } midx = getmaxx() / 2; midy = getmaxy() / 2; /* a user defined line pattern */ /* binary: "0000000000000001" */ userpat = 1; for (style=SOLID_LINE; style<=USERBIT_LINE; style++) { /* select the line style */ setlinestyle(style, userpat, 1); /* convert style into a string */ strcpy(stylestr, lname[style]); /* draw a line */ line(0, 0, midx-10, midy); /* draw a rectangle */ rectangle(0, 0, getmaxx(), getmaxy()); /* output a message */ outtextxy(midx, midy, stylestr); /* wait for a key */ getch(); cleardevice(); } /* clean up */ closegraph(); return 0; }

函數名: setmem

功能: 存值到存儲區

用法: void setmem(void *addr, int len, char value);

程序例:

#include #include #include int main(void) { char *dest; dest = calloc(21, sizeof(char)); setmem(dest, 20, 'c'); printf("%s\n", dest); return 0; }

函數名: setmode

功能: 設置打開文件方式

用法: int setmode(int handle, unsigned mode);

程序例:

#include #include #include int main(void) { int result; result = setmode(fileno(stdprn), O_TEXT); if (result == -1) perror("Mode not available\n"); else printf("Mode successfully switched\n"); return 0; }

函數名: setpalette

功能: 改變調色板的顏色

用法: void far setpalette(int index, int actural_color);

程序例:

#include #include #include #include int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int color, maxcolor, ht; int y = 10; char msg[80]; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } maxcolor = getmaxcolor(); ht = 2 * textheight("W"); /* display the default colors */ for (color=1; color<=maxcolor; color++) { setcolor(color); sprintf(msg, "Color: %d", color); outtextxy(1, y, msg); y += ht; } /* wait for a key */ getch(); /* black out the colors one by one */ for (color=1; color<=maxcolor; color++) { setpalette(color, BLACK); getch(); } /* clean up */ closegraph(); return 0; }

函數名: setrgbpalette

功能: 定義IBM8514圖形卡的顏色

用法: void far setrgbpalette(int colornum, int red, int green, int blue);

程序例:

#include #include #include #include int main(void) { /* select a driver and mode that supports the use */ /* of the setrgbpalette function. */ int gdriver = VGA, gmode = VGAHI, errorcode; struct palettetype pal; int i, ht, y, xmax; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } /* grab a copy of the palette */ getpalette(&pal); /* create gray scale */ for (i=0; i setrgbpalette(pal.colors[i], i*4, i*4, i*4); /* display the gray scale */ ht = getmaxy() / 16; xmax = getmaxx(); y = 0; for (i=0; i { setfillstyle(SOLID_FILL, i); bar(0, y, xmax, y+ht); y += ht; } /* clean up */ getch(); closegraph(); return 0; }

函數名: settextjustify

功能: 為圖形函數設置文本的對齊方式

用法: void far settextjustify(int horiz, int vert);

程序例:

#include #include #include #include /* function prototype */ void xat(int x, int y); /* horizontal text justification settings */ char *hjust[] = { "LEFT_TEXT", "CENTER_TEXT", "RIGHT_TEXT" }; /* vertical text justification settings */ char *vjust[] = { "LEFT_TEXT", "CENTER_TEXT", "RIGHT_TEXT" }; int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy, hj, vj; char msg[80]; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } midx = getmaxx() / 2; midy = getmaxy() / 2; /* loop through text justifications */ for (hj=LEFT_TEXT; hj<=RIGHT_TEXT; hj++) for (vj=LEFT_TEXT; vj<=RIGHT_TEXT; vj++) { cleardevice(); /* set the text justification */ settextjustify(hj, vj); /* create a message string */ sprintf(msg, "%s %s", hjust[hj], vjust[vj]); /* create cross hairs on the screen */ xat(midx, midy); /* output the message */ outtextxy(midx, midy, msg); getch(); } /* clean up */ closegraph(); return 0; } /* draw an "x" at (x, y) */ void xat(int x, int y) { line(x-4, y, x+4, y); line(x, y-4, x, y+4); }

函數名: settextstyle

功能: 為圖形輸出設置當前的文本屬性

用法: void far settextstyle (int font, int direction, char size);

程序例:

#include #include #include #include /* the names of the text styles supported */ char *fname[] = { "DEFAULT font", "TRIPLEX font", "SMALL font", "SANS SERIF font", "GOTHIC font" }; int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int style, midx, midy; int size = 1; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } midx = getmaxx() / 2; midy = getmaxy() / 2; settextjustify(CENTER_TEXT, CENTER_TEXT); /* loop through the available text styles */ for (style=DEFAULT_FONT; style<=GOTHIC_FONT; style++) { cleardevice(); if (style == TRIPLEX_FONT) size = 4; /* select the text style */ settextstyle(style, HORIZ_DIR, size); /* output a message */ outtextxy(midx, midy, fname[style]); getch(); } /* clean up */ closegraph(); return 0; }

函數名: settextstyle

功能: 為圖形輸出設置當前的文本屬性

用法: void far settextstyle (int font, int direction, char size);

程序例:

函數名: settime

功能: 設置系統時間

用法: void settime(struct time *timep);

程序例:

#include #include int main(void) { struct time t; gettime(&t); printf("The current minute is: %d\n", t.ti_min); printf("The current hour is: %d\n", t.ti_hour); printf("The current hundredth of a second is: %d\n", t.ti_hund); printf("The current second is: %d\n", t.ti_sec); /* Add one to the minutes struct element and then call settime */ t.ti_min++; settime(&t); return 0; }

函數名: setusercharsize

功能: 為矢量字體改變字符寬度和高度

用法: void far setusercharsize(int multx, int dirx, int multy, int diry);

程序例:

#include #include #include #include int main(void) { /* request autodetection */ int gdriver = DETECT, gmode, errorcode; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } /* select a text style */ settextstyle(TRIPLEX_FONT, HORIZ_DIR, 4); /* move to the text starting position */ moveto(0, getmaxy() / 2); /* output some normal text */ outtext("Norm "); /* make the text 1/3 the normal width */ setusercharsize(1, 3, 1, 1); outtext("Short "); /* make the text 3 times normal width */ setusercharsize(3, 1, 1, 1); outtext("Wide"); /* clean up */ getch(); closegraph(); return 0; }

函數名: setvbuf

功能: 把緩沖區與流相關

用法: int setvbuf(FILE *stream, char *buf, int type, unsigned size);

程序例:

#include int main(void) { FILE *input, *output; char bufr[512]; input = fopen("file.in", "r+b"); output = fopen("file.out", "w"); /* set up input stream for minimal disk access, using our own character buffer */ if (setvbuf(input, bufr, _IOFBF, 512) != 0) printf("failed to set up buffer for input file\n"); else printf("buffer set up for input file\n"); /* set up output stream for line buffering using space that will be obtained through an indirect call to malloc */ if (setvbuf(output, NULL, _IOLBF, 132) != 0) printf("failed to set up buffer for output file\n"); else printf("buffer set up for output file\n"); /* perform file I/O here */ /* close files */ fclose(input); fclose(output); return 0; }

函數名: setvect

功能: 設置中斷矢量入口

用法: void setvect(int intr_num, void interrupt(*isr)());

程序例:

/***NOTE: This is an interrupt service routine. You can NOT compile this program with Test Stack Overflow turned on and get an executable file which will operate correctly. */ #include #include #include #define INTR 0X1C /* The clock tick interrupt */ void interrupt ( *oldhandler)(void); int count=0; void interrupt handler(void) { /* increase the global counter */ count++; /* call the old routine */ oldhandler(); } int main(void) { /* save the old interrupt vector */ oldhandler = getvect(INTR); /* install the new interrupt handler */ setvect(INTR, handler); /* loop until the counter exceeds 20 */ while (count < 20) printf("count is %d\n",count); /* reset the old interrupt handler */ setvect(INTR, oldhandler); return 0; }

函數名: setverify

功能: 設置驗證狀態

用法: void setverify(int value);

程序例:

#include #include #include int main(void) { int verify_flag; printf("Enter 0 to set verify flag off\n"); printf("Enter 1 to set verify flag on\n"); verify_flag = getch() - 0; setverify(verify_flag); if (getverify()) printf("DOS verify flag is on\n"); else printf("DOS verify flag is off\n"); return 0; }

函數名: setviewport

功能: 為圖形輸出設置當前視口

用法: void far setviewport(int left, int top, int right,

int bottom, int clipflag);

程序例:

#include #include #include #include #define CLIP_ON 1 /* activates clipping in viewport */ int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } setcolor(getmaxcolor()); /* message in default full-screen viewport */ outtextxy(0, 0, "* <-- (0, 0) in default viewport"); /* create a smaller viewport */ setviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON); /* display some text */ outtextxy(0, 0, "* <-- (0, 0) in smaller viewport"); /* clean up */ getch(); closegraph(); return 0; }