同学通讯录系统C语言代码

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
 
enum Sex{male, female};    /* 性别 */

struct Date       /* 日期 */
{
  int year;
  int month;
  int day;
};
 
struct Info
{
  char num[10];                 /* 学号 */
  char name[15];                 /* 姓名 */
  enum Sex sex;                 /* 性别 */
  struct Date birthday;         /* 出生年月*/
  char addr[30];                /* 地址  */
  char phone[15];                /* 电话  */
};
 
 
char menu()       /* 菜单选择函数 */
{
  char n;                   /* n记录选择的菜单 */
  system("cls");                   /*清屏*/
  puts("\t\t    Welcome to students contacts system ");

  puts("\t\t*********************MENU********************\n");
  puts("\t\t\t\t1.Append inform\n");
  puts("\t\t\t\t2.Display inform\n");
  puts("\t\t\t\t3.Search inform\n");
  puts("\t\t\t\t4.Modify inform\n");
  puts("\t\t\t\t5.Delete inform\n");
  puts("\t\t\t\t6.Exit\n");
  puts("\t\t*********************************************\n");
  printf("Choice your number(1-6):[ ]\b\b");
  while(1)
  {
      n=getchar();getchar();
      if(n<'1'||n>'6')
        printf("Input error,please input again(1-6):[ ]\b\b");
      else
        break;     
  }
  return n;
}
 
void append()        /* 信息添加函数 */
{
  struct Info info;
  FILE * fp;
  char ch;
  char temp[10];
  if((fp=fopen("inform.txt","ab")) == NULL)
  {
    printf("\tCan not open the inform file!");
    getch();