c語言：模擬實現printf,要求功能：print("ccc\ts!",'b','i','t',"welcome to you");

c語言：模擬實現printf,要求功能：print("ccc\ts!",'b','i','t',"welcome to you");

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
int my_printf(const char *fmt, ...)
{
const char *s;
char c;
va_list ap;//參數列表
va_start(ap, fmt);//取的fmt指針給ap
while (*fmt)
{
/*if (*fmt != ‘s‘ || *fmt != ‘c‘)
{
putchar(*fmt++);
continue;
}*/
switch (*fmt)
{
case 's':
s = va_arg(ap, const char *);//取參數
for (; *s; s++)//通過循環，打印字符串內容
{
putchar(*s);
}
break;
case 'c':
c = va_arg(ap, char);
putchar(c);
break;
default:
putchar(*fmt);
break;
}
fmt++;
}
va_end(ap);//置0
}


int main()
{
char a = 'b';
my_printf("ccc\ts!", 'b', 'i', 't', "welcome to you");
system("pause");
return 0;
}