c語言 學生信息管理系統

c語言 學生信息管理系統

130

Ixiaofei423#include <stdio.h>
#include<stdlib.h>
#include<conio.h>
#include <string.h>
#include <io.h>
#define NULL 0
#define LEN sizeof(struct student)

 
struct student  
{
 long int num;
 char name[20];
 int age;
 char sex[4];
 char address[30];
 long int tele_num;
 char E_mail[20];
 struct student *next;
};

int TOTAL_NUM = 0;
struct student *head = NULL;
void record();
void insert(struct student *stu);
void display(struct student *stu);
void displayAll();
void query();
void query_by_num();
void freeAll();
void devise(struct student *p);
//系統主菜單
void main()
{
    int choice;
    choice = -1;
 do
    {
        printf("\n\n\n");
        printf("\t\t\t--------------------------------\n");
  printf("\t\t\t+        學生信息管理系統      |\n"); 
  printf("\t\t\t--------------------------------\n");              
  printf("\t\t\t+    [1]----錄入學生信息       |\n");
  printf("\t\t\t+    [2]----浏覽學生信息       |\n");
     printf("\t\t\t+    [3]----查詢學生信息       |\n");
 
  printf("\t\t\t+    [0]----退出系統           |\n");
  printf("\t\t\t+*·*·*·*·*·*·*·*·*·*·|\n");
  printf("\t\t\t--------------------------------\n");
        printf("請輸入您的選擇：");
        scanf("%d", &choice);
        switch(choice)
        {
  case 0:
   freeAll();
   break;
        case 1:
                record();
                break;
        case 2:
                displayAll();
                break;
        case 3:
                query();
                break;
  default:
                printf("\n無效選項!");
                break;
        }
    }
    while(choice != 0);
}
//錄入學生信息
void record()
{
 int i=0;
 struct student *p0,*head;  
 char a;
 do
 {
 p0 = (struct student *)malloc(LEN);
 printf("請輸入學生的學號:");
 scanf("%ld",&p0->num);   
 fflush(stdin);
 printf("請輸入學生的姓名:");
 scanf("%s",p0->name);
 fflush(stdin);
 printf("請輸入學生的年齡:");
 scanf("%d",&p0->age);
 fflush(stdin);
 printf("請輸入學生的性別:");
 scanf("%s",p0->sex);
 fflush(stdin);
 printf("請輸入學生的籍貫:");
 scanf("%s",p0->address);
 fflush(stdin);
 printf("請輸入學生的電話:");
 scanf("%ld",&p0->tele_num);
 fflush(stdin);
 printf("請輸入學生的E-mail:");
 scanf("%s",p0->E_mail);
 fflush(stdin);

printf("\n是否繼續輸入另外一個學生信息?(y/n)");
 a=getchar();
i++;
}while(a=='y' && i<=50);
 TOTAL_NUM=i;
 head=p0;
}

 

void insert(struct student *stu)
{
 struct student *p0, *p1, *p2;
 
 p1 = head;
 p0 = stu;
 
 if(head == NULL)
 {
  head = p0;
  p0->next = NULL;
 }
 else
 {
  while((p0->num > p1->num)&&(p1->next != NULL))
  {
      p2 = p1;
   p1 = p1->next;
  }
  if(p0->num <= p1->num)
  {
   if(head == p1)
   head = p0;
   else
   p2->next = p0;
   p0->next = p1;
  }
  else
  {
   p1->next = p0;
   p0->next = NULL;
  } 
 }
 TOTAL_NUM++;
}

void display(struct student *p)
{
 printf("%ld\t%s\t%d\t%s\t%s\t%ld\t%s\n", p->num, p->name, p->age, p->sex,p->address, p->tele_num, p->E_mail);
}
//浏覽學生信息
void displayAll()
{
 struct student *p;

 printf("學生總數:%d\n", TOTAL_NUM);
 
 if(head != NULL)
 {
  do
{
printf("%10d%10s%10d%10s%10s\n",p->num,p->name,p->age,p->sex,p->E_mail);
p=p->next;
} while(p!=NULL);

 }
 printf("\n");
}
//查詢學生信息
void query()
{
 int choice;
    choice = -1;
 do
    {
        printf("\n");
        printf("+--------------------+\n");
        printf("| 按學號查詢  請按 1 |\n");
           
  printf("| 取消        請按 0 |\n");
        printf("+--------------------+\n");

        printf("請輸入您的選擇：");
        scanf("%d", &choice);
      
        switch(choice)
        {
            case 0:
                return;
            case 1:
                query_by_num();
                break;
          
            
                        
            default:
                printf("\n無效選項!");
                break;
        }
    }
    while(choice != 0);
}
//按學號查詢學生信息
void query_by_num()
{
 int num;
 struct student *p1;

 printf("請輸入學生的學號：");
 scanf("%ld", &num);
 if(head==NULL)
 {
  printf("無學生記錄！\n");
  return;
 }
 p1=head;
 while(num!=p1->num && p1->next!=NULL)
  p1=p1->next;
 if(num == p1->num)
 {
  printf("\n學號\t姓名\t年齡\t性別\t出生年月\t地址\t電話\tE-mail\n");
  printf("-------------------------------------------------------------------------------");
  display(p1);
 }
 else
  printf("沒有該學生記錄，請核對！");
}

 

void freeAll()
{
 struct student *p1, *p2;

 p1=p2=head;
 while(p1)
 {
  p2=p1->next;
  free(p1);
  p1=p2;
 }
}

上面是我的代碼和運行是的截圖，我明明已經讀入學生信息了，為什麼在顯示信息的時候只有學生數沒有學生信息啊？？還有為什麼查詢也不行啊？？？誰能幫我改改？？我改好長時間了都不行！！！！順便幫我把流程圖畫了！謝謝！！！

補充：

抓緊啊

  我趕時間用！！！！！

最佳回答：

樓上的還是有點問題，在錄入函數裡面。

補充：

這是我修改之後的

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
#include <io.h>
#define NULL 0
#define LEN sizeof(struct student)

struct student  
{
    long int num;
    char name[20];
    int age;
    char sex[4];
    char address[30];
    long int tele_num;
    char E_mail[20];
    struct student *next;
};

int TOTAL_NUM = 0;
struct student *head = NULL;

void record();
void insert(struct student *stu);
void display(struct student *stu);
void displayAll();
void query();
void query_by_num();
void freeAll();
void devise(struct student *p);
//系統主菜單
void main()
{
    int choice;
    choice = -1;
    do
    {
        printf("\n\n\n");
        printf("\t\t\t--------------------------------\n");
        printf("\t\t\t+        學生信息管理系統      |\n"); 
        printf("\t\t\t--------------------------------\n");              
        printf("\t\t\t+    [1]----錄入學生信息       |\n");
        printf("\t\t\t+    [2]----浏覽學生信息       |\n");
        printf("\t\t\t+    [3]----查詢學生信息       |\n");
       
        printf("\t\t\t+    [0]----退出系統           |\n");
        printf("\t\t\t+*·*·*·*·*·*·*·*·*·*·|\n");
        printf("\t\t\t--------------------------------\n");
        printf("請輸入您的選擇：");
        scanf("%d", &choice);
        switch(choice)
        {
        case 0:
            freeAll();
            break;
        case 1:
            record();
            break;
        case 2:
            displayAll();
            break;
        case 3:
            query();
            break;
        default:
            printf("\n無效選項!");
            break;
        }
    }
    while(choice != 0);
}
//錄入學生信息
void record()
{
    int i=0;
    struct student *p0,*p1;  
    char a;
    do
    {
        p0 = (struct student *)malloc(LEN);
        printf("請輸入學生的學號:");
        scanf("%ld",&p0->num);   
        fflush(stdin);
        printf("請輸入學生的姓名:");
        scanf("%s",p0->name);
        fflush(stdin);
        printf("請輸入學生的年齡:");
        scanf("%d",&p0->age);
        fflush(stdin);
        printf("請輸入學生的性別:");
        scanf("%s",p0->sex);
        fflush(stdin);
        printf("請輸入學生的籍貫:");
        scanf("%s",p0->address);
        fflush(stdin);
        printf("請輸入學生的電話:");
        scanf("%ld",&p0->tele_num);
        fflush(stdin);
        printf("請輸入學生的E-mail:");
        scanf("%s",p0->E_mail);
        fflush(stdin);
  if(i==0) head=p0;
  else p1->next=p0;
  p1=p0;           

        printf("\n是否繼續輸入另外一個學生信息?(y/n)");
        a=getchar();
        i++;
    }while(a=='y' && i<=50);
    TOTAL_NUM=i;
    p1->next=NULL;
}

 

void insert(struct student *stu)
{
    struct student *p0, *p1, *p2;
   
    p1 = head;
    p0 = stu;
   
    if(head == NULL)
    {
        head = p0;
        p0->next = NULL;
    }
    else
    {
        while((p0->num > p1->num)&&(p1->next != NULL))
        {
            p2 = p1;
            p1 = p1->next;
        }
        if(p0->num <= p1->num)
        {
            if(head == p1)
                head = p0;
            else
                p2->next = p0;
            p0->next = p1;
        }
        else
        {
            p1->next = p0;
            p0->next = NULL;
        } 
    }
    TOTAL_NUM++;
}

void display(struct student *p)
{
    printf("\n%ld\t%s\t%d\t%s\t%s\t%ld\t%s\n", p->num, p->name, p->age, p->sex,p->address, p->tele_num, p->E_mail);
}
//浏覽學生信息
void displayAll()
{
    struct student *p;
   
    printf("學生總數:%d\n", TOTAL_NUM);
   
    if((p = head) != NULL)    //細心點撒
    {
        do
        {
            printf("%10d%10s%10d%10s%10s\n",p->num,p->name,p->age,p->sex,p->E_mail);
            p=p->next;
        } while(p!=NULL);
    }
    printf("\n");
}
//查詢學生信息
void query()
{
    int choice;
    choice = -1;
    do
    {
        printf("\n");
        printf("+--------------------+\n");
        printf("| 按學號查詢  請按 1 |\n");
       
        printf("| 取消        請按 0 |\n");
        printf("+--------------------+\n");
       
        printf("請輸入您的選擇：");
        scanf("%d", &choice);
       
        switch(choice)
        {
        case 0:
            return;
        case 1:
            query_by_num();
            break;
        default:
            printf("\n無效選項!");
            break;
        }
    }
    while(choice != 0);
}
//按學號查詢學生信息
void query_by_num()
{
    int num;
    struct student *p1;
   
    printf("請輸入學生的學號：");
    scanf("%ld", &num);
    if(head==NULL)
    {
        printf("無學生記錄！\n");
        return;
    }
    p1=head;
    while(num!=p1->num && p1->next!=NULL)
        p1=p1->next;
    if(num == p1->num)
    {
        printf("\n學號\t姓名\t年齡\t性別\t出生年月\t地址\t電話\tE-mail\n");
        printf("-------------------------------------------------------------------------------");
        display(p1);
    }
    else
        printf("沒有該學生記錄，請核對！");
}

 

void freeAll()
{
    struct student *p1, *p2;
   
    p1=p2=head;
    while(p1)
    {
        p2=p1->next;
        free(p1);
        p1=p2;
    }
}