求C语言程序？？？？

·········C语言C语言
C语言

补充：学生管理系统

答案：恩，我就是ChooserFan
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#define N 100
int  menu( ); 
void data_input( );
int  read_data(struct student stu[]);
void Delete_data();//增加的功能--删除功能
void printf_data(struct student stu[], int n);
void sort_num(struct student stu[], int n);
void sort_score(struct student stu[], int n);
void search_num(struct student stu[], int n, char find_num[]);
void search_name(struct student stu[], int n, char find_name[]);
void count_academy(struct student stu[], int n, char count_ac[]);
struct student 
{ 
 char num[14]; 
 char name[16]; 
 int age; 
 int score; 
 char academy[20]; 
}; 
void main( ) 
{ 
 int item, n, flag = 121;
 struct student stu[N];
 char find_num[14], find_name[16], count_ac[20];
   
 while ((flag == 121) || (flag == 89))   //121是'y'的ASCII码，89是'Y'的ASCII码
 { item = menu( ); 
  switch(item) 
  { 
   case 1: 
     data_input();   
     break; 
   case 2: 
     n = read_data(stu);  
     sort_num(stu, n);  
     printf_data(stu,n);
     break; 
   case 3: 
     n = read_data(stu);  
     sort_score(stu, n);   
     printf_data(stu,n);
     break; 
   case 4: 
     n = read_data(stu);  
     sort_num(stu, n);    
     printf("\n请输入待查学生的学号：");
     scanf("%s", find_num);
     search_num(stu, n, find_num);   
     break; 
   case 5: 
     n = read_data(stu); 
     printf("\n请输入待查学生的姓名：");
     scanf("%s", find_name);
     search_name(stu, n, find_name); 
     break; 
   case 6: 
     n = read_data(stu); 
     printf("\n请输入要统计的学院名称：");
     scanf("%s", count_ac);
     count_academy(stu, n, count_ac);   
     break;
   case 7: 
     Delete_data();//函数调用  
     break;
   case 0: 
     printf("\n谢谢您的使用，再见！\n");  
     exit(0); 
  } 
  printf("\n是否继续？（按Y继续，否则退出）:\n"); 
  flag = getch();
  if ((flag != 121) && (flag != 89))
  { printf("\n谢谢您的使用，再见！\n"); 
   exit(0); 
  }
 }
} 
int menu( ) //展示菜单，返回用户的输入选项
{  
 printf("\n1--输入学生数据");
 printf("\n2--依据学号查询数据");
 printf("\n3--依据成绩查询数据 ");
 printf("\n4--依据学号查询数据");
 printf("\n5--依据姓名查询数据");
 printf("\n6--统计某学院的人数");
 printf("\n7--删除");
 printf("\n0--退出");
 //int item;
 scanf("%d", &item);  
    return item;
}
void data_input() //学生信息录入，数据保存在文件student_info.txt中
{ 
 int i = 0, n; 
 FILE *fp; 
 struct student stu[N];
 if((fp = fopen("student_info.txt", "a")) == NULL) 
 { 
  printf("\n文件无法打开，程序退出！\n"); 
  exit(0); 
 } 
 printf("\n请输入记录个数: "); 
 scanf("%d", &n);  
 printf("\n%14s%16s%6s%10s%20s\n", "学号", "姓名", "年龄", "入学成绩", "学院");
 for(i = 0; i < n; i++) 
 { 
  printf("输入第%d个学生记录:\n", i + 1);  
  scanf("%s%s%d%d%s", stu[i].num, stu[i].name, &stu[i].age, &stu[i].score, stu[i].academy);
  fprintf(fp, "%14s%16s%6d%10d%20s\n", stu[i].num, stu[i].name, stu[i].age, stu[i].score, stu[i].academy);
 }
 fclose(fp);
} 
int read_data(struct student stu[])   //从文件student_info.txt中读出数据
{
 FILE *fp;
 int i = 0;
 if((fp = fopen("student_info.txt","r")) == NULL)
 {
  printf("\n文件无法打开，程序退出！\n");
  exit(0);
 } 
 while(fscanf(fp, "%s%s%d%d%s", stu[i].num, stu[i].name, &stu[i].age, &stu[i].score, stu[i].academy) > 1) 
  i++;
 return i;
}
void printf_data(struct student stu[ ], int n)
{
 for(i=0;i<N;i++)
 printf("num:%c  name:%c  age:%d  score:%d   academy:%c\n",stu[i].num, stu[i].name, &stu[i].age, &stu[i].score, stu[i].academy);
}
void sort_num(struct student stu[], int n)//按学号排序  
{
 for(j=1;j<=n;j++)
    for(i=1;i<=n-j;i++)
    if(stu[i].num>stu[i+1].num)
    {
  t=stu[i].num; 
  stu[i].num=stu[i+1].num;
  stu[i+1].num=t;
 }
    printf("按照学号排序后的结果:\n");
    for(i=1;i<n;i++)
 printf("\n%14s%16s%6s%10s%20s\n", "学号", "姓名", "年龄", "入学成绩", "学院");
}
void sort_score(struct student stu[], int n)// 按入学成绩排序
{
 for(j=1;j<=n;j++)
    for(i=1;i<=n-j;i++)
    if(stu[i].score>stu[i+1].score)
    {
  t=stu[i].score; 
  stu[i].score=stu[i+1].score;
  stu[i+1].score=t;
 }
    printf("按照入学成绩排序后的结果:\n");
    for(i=1;i<n;i++)
 printf("\n%14s%16s%6s%10s%20s\n", "学号", "姓名", "年龄", "入学成绩", "学院");
}
void search_num(struct student stu[], int n, char find_num[])   //按学号查询（折半查找）
{ 
  int iIndex=0;
  int iStart=0;
  int iEnd=n-1;
  while(true)
  {
   iIndex = (iStart+iEnd)/2;
   if(stu[iIndex]<iSeek)
   {
    iStart = iIndex;
   }
   else if(stu[iIndex]>iSeek)
   {
    iEnd = iIndex;
   }
   else
   {
    break;
   }
  }
 printf("\n%14s%16s%6s%10s%20s\n", "学号", "姓名", "年龄", "入学成绩", "学院");
}
void search_name(struct student stu[], int n, char find_name[]) //按姓名查询（顺序查找）
{ 
 //char name[16]; 
 printf("请输入查询学生的姓名:\n"); 
 gets(name); /*获得学生姓名*/ 
 for(i=0;i<N;i++) 
  { 
  if (strcmp(name,stu[i].name)==0) 
   { 
    printf("num:%c  name:%c  age:%d  score:%d   academy:%c\n",stu[i].num, stu[i].name, &stu[i].age, &stu[i].score, stu[i].academy);
     break; 
   } 
  } 
 if (i>=m+n) 
 printf("******查无此人******\n"); 
}
void count_academy(struct student stu[], int n, char count_ac[])  // 按学院统计人数
{
 int m=0;
 printf("请输入要查学的学院的名称");
 gets(academy);
 for(i=0;i<N;i++) 
  { 
  if (strcmp(academy,stu[i].academy)==0 )
   { 
    m++;
    return m;
   } 
  } 
 if (i>=n)
  printf("这个学院总共有%d个学生:\n",m);
 
}

void Delete_data() //增加的功能函数
{
 printf("请输入要删除的学号：");
 gets(num);
 for(i=0;i<N;i++) 
  { 
  if (strcmp(num,stu[i].num)==0 )
   { 
    stu[i].num="", stu[i].name="", stu[i].age="", stu[i].score="", stu[i].academy=""
    
   } 
  } 
}
啥意思？
void main()
{printf("Hello World!");}
老兄 说明白点撒
有C++做的！用c语言太复杂了！
#include "stdio.h"    /*I/O函数*/
#include "stdlib.h"   /*其它说明*/
#include "string.h"   /*字符串函数*/
#include "conio.h"   /*屏幕操作函数*/
#include "mem.h"   /*内存操作函数*/
#include "ctype.h"   /*字符操作函数*/
#include "alloc.h"   /*动态地址分配函数*/
#define N 3       /*定义常数*/
typedef struct z1   /*定义数据结构*/
{
 char no[11];
 char name[15];
 int score[N];
 float sum;
 float average;
 int order;
 struct z1 *next;
}STUDENT;
STUDENT  *init();      /*初始化函数*/
STUDENT *create();   /*创建链表*/
STUDENT *delete(STU

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