程序代码：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <conio.h>
struct xx
{
    char xingming[15];
    char xingbie[5];
    char dianhua[13];
    char qq[13];
    char email[30];
};

int printf1()                              /*菜单函数*/
{
    int i;
    system("cls");
    printf("\t\t\t\t  通讯录\n");
    printf("--------------------------------------------------------------------------------");
    printf("1.浏览    ");
    printf("2.添加    ");
    printf("3.修改    ");
    printf("4.查找    ");
    printf("5.删除    ");
    printf("6.退出");
    printf("\n--------------------------------------------------------------------------------");
    printf("我要选择:");
    scanf("%d", &i);
    return i;
}
tj()                                       /*添加函数*/
{
    int a;
    struct xx XX;
    FILE *fp;
    if ((fp = fopen("xinxi.txt", "ab")) == NULL)
    {
        printf("错误!不能打开记录文件(xinxi.txt)!\n");
        getch();
        main();
    }
    system("cls");
    getchar();   /*用来接收'\n'*/
    printf("输入姓名:");
    gets(XX.xingming);
    printf("输入性别:");
    gets(XX.xingbie);
    printf("输入电话:");
    gets(XX.dianhua);
    printf("输入QQ:");
    gets(XX.qq);
    printf("输入E-mail:");
    gets(XX.email);
    fwrite(&XX, sizeof(XX), 1, fp);
    fclose(fp);
    printf("\n1.返回--2.继续--3.退出-->[ ]\b\b");
    scanf("%d", &a);

    if (a == 1)
    {
        return main();
    }
    else if (a == 2)
    {
        return tj();
    }
    else if (a == 3)
    {
        exit(0);
    }
    else
    {
        printf("错误,请按套路来!\n");
        getch();
        return main();
    }
}
xs()                                 /*显示函数*/
{
    FILE *fp;
    int i;
    struct xx XX;
    if ((fp = fopen("xinxi.txt", "rb")) == NULL)
    {
        printf("错误!不能打开记录文件(xinxi.txt)!");
        getch();
        main();
    }
    while (fread(&XX, sizeof(XX), 1, fp) == 1)
    {
        printf("姓名: %s\n", XX.xingming);
        printf("性别: %s\n", XX.xingbie);
        printf("电话: %s\n", XX.dianhua);
        printf("QQ  : %s\n", XX.qq);
        printf("E-m : %s\n\n", XX.email);
    }
    fclose(fp);
    printf("(1.返回||2.退出)-->[ ]\b\b");
    scanf("%d", &i);
    if (i == 1)
    {
        system("cls");
        return main();
    }
    else if (i == 2)
    {
        exit(1);
    }
    else
        printf("错误,请按套路来!");
    getch();
    system("cls");
    xs();
}
cx()                               /*查询函数*/
{
    struct xx XX;
    FILE *fp;
    int flag;
    int total;
    char ch[20];
    int b;
    int a;

    if ((fp = fopen("xinxi.txt", "rb")) == NULL)
    {
        printf("错误!不能打开记录文件(xinxi.txt)!");
        getch();
        main();
    }

    rewind(fp);                 //使指针返回文件首端
    system("cls");
    printf("( 1.按姓名查询 || 2.按电话查询 || 3.返回 )---->[ ]\b\b");
    scanf("%d", &flag);
    getchar();                  //接受%d

    if (flag == 1)
    {
        printf("输入姓名查询:");
        gets(ch);
        total = 0;
        while (fread(&XX, sizeof(XX), 1, fp) == 1)
            if (strcmp(ch, XX.xingming) == 0)
            {
                total++;
                if (total == 1)
                {
                    printf("\n姓名:%s", XX.xingming);
                    printf("姓别:%s\n", XX.xingbie);
                    printf("电话:%s\n", XX.dianhua);
                    printf("QQ  :%s\n", XX.qq);
                    printf("E-M :%s\n\n", XX.email);
                }
                else
                {
                    system("cls");
                    printf("找不到!重新查找吗?----->1.好    2.不   3.退出\n选择:");
                    scanf("%d", &a);
                    if (a == 1)
                        system("cls");
                    cx();
                    if (a == 2)
                        system("cls");
                    main();
                    if (a == 3)
                        return main();
                }
            }
        printf("1.继续||2.返回||3.退出-->[ ]\b\b");
        scanf("%d", &b);
        if (b == 1)
        {
            cx();
        }
        else if (b == 2)
        {
            system("cls");
            return main();
        }
        else
        {
            exit(1);
        }
        while (b < 0 || b > 3)
        {
            printf("请正确输入!");
            getch();
            cx();
        }
    }
    if (flag == 2)
    {
        printf("输入电话查询:");
        gets(ch);
        total = 0;
        while (fread(&XX, sizeof(XX), 1, fp) == 1)
            if (strcmp(ch, XX.dianhua) == 0)
            {
                total++;
                if (total == 1)
                {
                    printf("\n姓名:%s\n", XX.xingming);
                    printf("姓别:%s\n", XX.xingbie);
                    printf("电话:%s\n", XX.dianhua);
                    printf("QQ  :%s\n", XX.qq);
                    printf("E-M :%s\n\n", XX.email);
                }
            }

            else
            {
                printf("\n请正确选择!\n\n");
                getch();
                cx();
            }
        fclose(fp);
    }
}


xg()                                 /*修改函数*/
{
    struct xx XX;
    FILE *fp1, *fp2;
    int flag;
    char ch[15];
    int a;
    if ((fp1 = fopen("xinxi.txt", "rb")) == NULL)
    {
        printf("错误!不能打开记录文件(xinxi.txt)!");
        getch();
        main();
    }
    if ((fp2 = fopen("temp.txt", "wb")) == NULL)
    {
        printf("错误!不能打开记录文件(temp.txt)!");
        getch();
        main();
    }
    printf("要修改谁(输入名字):");
    gets(ch);
    getchar();
    flag = 0;
    while (fread(&XX, sizeof(XX), 1, fp1) == 1)
    {
        if (strcmp(ch, XX.xingming) == 0)
        {
            printf("\n姓名:%s\n", XX.xingming);
            printf("性别 :%s\n", XX.xingbie);
            printf("电话 :%s\n", XX.dianhua);
            printf("QQ :%s\n", XX.qq);
            printf("E-M :%s", XX.email);
            printf("\n\n\n按任意键,输入新记录!\n");
            getch();
            printf("姓名:");
            gets(XX.xingming);
            printf("性别:");
            gets(XX.xingbie);
            printf("电话:");
            gets(XX.dianhua);
            printf("QQ:");
            gets(XX.qq);
            printf("E-mail:");
            gets(XX.email);
            flag = 1;
        }
        fwrite(&XX, sizeof(XX), 1, fp2);
    }
    fclose(fp1);
    fclose(fp2);
    if (flag == 1)
    {
        printf("Modify sucess!\n");
        remove("xinxi.txt");
        rename("temp.txt", "xinxi.txt");
    }
    else
        printf("找不到这个记录!\n");
    getch();
    printf("1.继续||2.返回||3.退出-->[ ]\b\b");
    scanf("%d", &a);
    if (a == 1)
    {
        system("cls");
        xg();
    }
    else if (a == 2)
    {
        main();
    }
    else if (a == 3)
    {
        exit(0);
    }
}

main()
{
    switch (printf1())
    {
    case 1:
        system("cls");
        xs();
        break;
    case 2:
        system("cls");
        tj();
        break;
    case 3:
        system("cls");
        xg();
        break;
    case 4:
        system("cls");
        cx();
        break;
    case 5:
        printf("Deng Dai!");
        getch();
        main();
        break;
    case 6:
        exit(0);
        break;
    default:
        printf("\n\t\t错误!请输入1~6!\n\t\t按任意键重新输入!");
        getch();
        system("cls");
        main();
        break;
    }
}