分享原创：一个简单的学生信息管理系统（请大家提提意见）

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

#define NULL 0

struct student{
    char name[20];
    char id[20];
    char sex[3];
    int year,month;
    char major[50];
    char ban_ji[50];
    char address[50];
    char phone_num[20];

};

int main(int argc, char* argv[])
{
    FILE* fp;
    fp=fopen("学生成绩管理系统.txt","ab+");
    if(fp==NULL){
        printf("打开文件失败！\n");
        exit(1);
    }
    while(1){
    printf("*******************欢迎使用学生成绩管理系统！**********************\n");
    printf("1.录入学生信息\n");
    printf("2.显示学生信息\n");
    printf("3.查找学生\n");
    printf("4.退出\n");
    printf("********************************************************************\n");
    printf("请选择要操作的项目：");
    int i;
    scanf("%d",&i);
    switch(i){
    case 1:
        {
        struct student *p=(student*)malloc(sizeof(struct student));
        if(p==NULL){
            printf("申请内存失败！\n");
            exit(1);
        }
        printf("请输入学生姓名：");
        scanf("%s",p->name);

        printf("请输入学生学号：");
        scanf("%s",p->id);

        printf("请输入学生性别：");
        scanf("%s",p->sex);

        printf("请输入学生出生年份：");
        scanf("%d",&p->year);

        printf("请输入学生出生月份：");
        scanf("%d",&p->month);

        printf("请输入学生的专业：");
        scanf("%s",p->major);

        printf("请输入学生所在的班级：");
        scanf("%s",p->ban_ji);

        printf("请输入学生的家庭住址：");
        scanf("%s",p->address);

        printf("请输入学生的宿舍电话：");
        scanf("%s",p->phone_num);

        fwrite(p,sizeof(struct student),1,fp);

        free(p);
        p=NULL;
        }
        system("pause");
        system("cls");
        break;
    case 2:
        {
            struct student* p=(student*)malloc(sizeof(struct student));
            if(p==NULL){
                printf("申请内存失败！\n");
                exit(1);
            }
            rewind(fp);
            while(!feof(fp)){
                if(fread(p,sizeof(struct student),1,fp))
                    printf("姓名：%s\n学号：%s\n性别：%s\n出生年月：%d %d\n专业：%s\n所在班级：%s\n家庭住址：%s\n宿舍电话：%s\n\n",
                            p->name,p->id,p->sex,p->year,p->month,p->major,p->ban_ji,p->address,p->phone_num);
            }
            free(p);
            p=NULL;
        }
        system("pause");
        system("cls");
        break;
    case 3:
        rewind(fp);
        printf("1.按姓名查找\n2.按学号查找\n");
        int j;
        scanf("%d",&j);
        switch(j){
        case 1:
            {
                char names[20];
                int n=0;
                printf("请输入要查找的学生的姓名：");
                scanf("%s",names);
                struct student* p=(student*)malloc(sizeof(struct student));
                if(p==NULL){
                    printf("申请内存失败！\n");
                    exit(1);
                }
                while(!feof(fp)){
                    if(fread(p,sizeof(struct student),1,fp))
                        if(strcmp(p->name,names)==0){
                            n++;
                            printf("姓名：%s\n学号：%s\n性别：%s\n出生年月：%d %d\n专业：%s\n所在班级：%s\n家庭住址：%s\n宿舍电话：%s\n\n",
                                    p->name,p->id,p->sex,p->year,p->month,p->major,p->ban_ji,p->address,p->phone_num);
                        }
                }
                if(!n)    printf("没有对应的信息！\n");               
            }
            break;
        case 2:
            {
                char number[20];
                int n=0;
                printf("请输入要查找的学生的学号：");
                scanf("%s",number);
                struct student* p=(student*)malloc(sizeof(struct student));
                if(p==NULL){
                    printf("申请内存失败！\n");
                    exit(1);
                }
                while(!feof(fp)){
                    if(fread(p,sizeof(struct student),1,fp))
                        if(strcmp(p->id,number)==0){
                            n++;
                            printf("姓名：%s\n学号：%s\n性别：%s\n出生年月：%d %d\n专业：%s\n所在班级：%s\n家庭住址：%s\n宿舍电话：%s\n\n",
                                    p->name,p->id,p->sex,p->year,p->month,p->major,p->ban_ji,p->address,p->phone_num);
                        }
                }
                if(!n)    printf("没有对应的信息！\n");   


            }
            break;
        default:printf("您的输入无效！\n");
        }
        system("pause");
        system("cls");
        break;
    case 4:exit(0);
        break;
    default:printf("您的输入无效！\n");

    }



    }
    fclose(fp);

    return 0;
}