c语言可以做出完整的吗有人看看吗

c语言学不明白，打出来也运行不出来，真的没办法了，有人帮忙看看吗，真的很需要！（初级学到了循环）

手打

#include <stdio.h>
// 定义学生结构体，包括学号、姓名、性别、班级和C语言成绩
struct student {
    int  id;
    char name[20];
    char gender[5];
    char cls[20];
    float score;
};

// 显示菜单函数
void show_menu() {
    printf("*****************************\n");
    printf("*   学生成绩管理系统菜单   *\n");
    printf("*****************************\n");
    printf("*   1. 录入学生信息       *\n");
    printf("*   2. 删除学生信息       *\n");
    printf("*   3. 查询学生信息       *\n");
    printf("*   4. 排序学生成绩       *\n");
    printf("*   0. 退出系统           *\n");
    printf("*****************************\n");
}

// 录入学生信息函数
void add_student(struct student *students) {
    int i;
    // 遍历学生信息数组，找到空闲位置录入学生信息
    for (i = 0; i < 5; i++) {
        if ((students[i].id) == 0) { // 找到空闲位置，学号为0,说明该位置为空
            printf("请输入学生姓名：");
            scanf("%s", students[i].name);

            printf("请输入学生学号：");
            scanf("%d", &students[i].id);

            printf("请输入学生班级：");
            scanf("%s", students[i].cls);

            printf("请输入学生性别：");
            scanf("%s", students[i].gender);

            printf("请输入学生C语言成绩：");
            scanf("%f", &students[i].score);

            printf("录入成功！\n");
            return;
        }
    }
    printf("学生信息已满，无法添加新的学生信息！\n");
}

// 删除学生信息函数
void delete_student(struct student *students) {
    int keyword;
    int deleted = 0; // 记录是否删除了学生信息
    int i;
    printf("请输入要删除的学生学号：");

    scanf("%d", &keyword);

    // 遍历学生信息数组，找到匹配的学生信息并将其学号改为0
    for (i = 0; i < 5; i++) {
        if (keyword==students[i].id) {
            students[i].id=0;//把学号改成0,作为删除的标志
            deleted = 1;
        }
    }

    if (deleted) {
        printf("删除学生信息成功！\n");
    } else {
        printf("未找到该学生信息！\n");
    }
}

// 查询学生信息函数
void search_student(struct student *students) {
    int keyword,i;
    int found = 0; // 记录是否找到了学生信息
    printf("请输入要查询的学生学号：");
    scanf("%d", &keyword);

    // 遍历学生信息数组，找到匹配的学生信息并输出
    for (i = 0; i < 5; i++) {
        if (keyword==students[i].id) {
            printf("学生姓名：%s\n", students[i].name);
            printf("学生学号：%d\n", students[i].id);
            printf("学生班级：%s\n", students[i].cls);
            printf("学生性别：%s\n", students[i].gender);
            printf("学生C语言成绩：%.2f\n", students[i].score);
            found = 1;
        }
    }

    if (!found) {
        printf("未找到该学生信息！\n");
    }
}

// 输出学生信息函数
void print(struct student *students){
    int i;
    printf("| 学号 | 姓名 | 性别 | 班级 | C语言成绩 |\n");
    printf("----------------------------------------\n");
    for(i=0;i<5;i++){
        if(students[i].id==0){//表示该学生不存在
            continue;//继续循环
        }
        printf("| %-4d | %-4s | %-2s | %-4s | %-10.2f |\n", students[i].id, students[i].name, students[i].gender, students[i].cls, students[i].score);
    }
}

// 排序学生成绩函数
void sort_student(struct student *students) {
    int choice;
    int i,j;
    printf("请选择排序方式：1. 按成绩从高到低排序；2. 按成绩从低到高排序：");
    scanf("%d", &choice);

    switch (choice) {
        case 1: // 按成绩从高到低排序,冒泡排序
            for (i = 0; i < 5 - 1; i++) {
                for (j = i + 1; j < 5; j++) {
                    if (students[i].score < students[j].score) { // 比较成绩，交换位置
                        struct student temp = students[i];
                        students[i] = students[j];
                        students[j] = temp;
                    }
                }
            }
            printf("按成绩从高到低排序完成！\n");
            print(students);
            break;
        case 2: // 按成绩从低到高排序，冒泡排序
            for (i = 0; i < 5 - 1; i++) {
                for (j = i + 1; j < 5; j++) {
                    if (students[i].score > students[j].score) { // 比较成绩，交换位置
                        struct student temp = students[i];
                        students[i] = students[j];
                        students[j] = temp;
                    }
                }
            }
            printf("按成绩从低到高排序完成！\n");
            print(students);
            break;
        default:
            printf("无效的选择！\n");
            break;
    }
}

struct student students[5]; // 学生信息数组

int main() {
    // 初始化学号为0
    for(int i=0;i<5;i++)
    {
        students[i].id=0;//初始化学号为0
    }
    int choice,quit=1;

    while (1) {
        show_menu();
        printf("请输入您的选择：");
        
        scanf("%d", &choice);

        switch (choice) {
            case 0:
                printf("感谢使用学生成绩管理系统，再见！\n");
                quit=0;
                break;
            case 1:
                add_student(students);
                break;
            case 2:
                delete_student(students);
                break;
            case 3:
                search_student(students);
                break;
            case 4:
                sort_student(students);
                break;
            default:
                printf("无效的选择！\n");
                break;
        }
        if(quit==0){
            break;
        }
    }

    return 0;
}

这个问题 今天 问的一大堆啊 , 而且 csdn 的博客里也一大堆

#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_DEPRECATE)
#define _CRT_SECURE_NO_DEPRECATE
#endif
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
class Student{
public:
    friend void Input(Student stu[]);
    friend void Statistic(Student stu[]);
    friend void Lookup(Student stu[]);
    friend void Modify(Student stu[]);
    friend void Delete(Student stu[]);
    friend void Output(Student stu[]);
    friend void Insert(Student stu[]);
    friend void Sort(Student stu[]);
    friend void Write(Student stu[],int n);
    friend int Read(Student stu[]);
private:
    int num;
    char name[8];
    char class_0[20];
    float elec;
    float c_program;
    float english;
    float math;
    float media;
    float sport;
    float polity;
    float average;
    int order;
}stu[100];
 
void Write(Student stu[], int n) {
    fstream myFile;
    myFile.open("score.txt", ios::out | ios::binary);
    if (!myFile) {
        cout << "score.txt can't open!" << endl;
        abort();
    }
    int count = n;
    myFile << count << endl<<endl;
    for (int i = 0; i < count; i++) {
        myFile << stu[i].class_0  << "\t"
               << stu[i].num      << "\t"
               << stu[i].name     << "\t"
               << stu[i].elec     << "\t"
               << stu[i].c_program<< "\t"
               << stu[i].media    << "\t"
               << stu[i].english  << "\t"
               << stu[i].math     << "\t"
               << stu[i].sport    << "\t"
               << stu[i].polity   << "\t"
               << stu[i].average  << endl;
    }
    myFile.close();
}
 
int Read(Student stu[]) {
    fstream myFile;
    myFile.open("score.txt", ios::in | ios::binary);
    if (!myFile) {
        cout << "score.txt can't open!" << endl;
        abort();
    }
    int count;
    myFile.seekg(0);
    myFile >> count;
    for (int i = 0; i <= count; i++) {
        myFile >> stu[i].class_0 >> stu[i].num       >> stu[i].name 
               >> stu[i].elec    >> stu[i].c_program >> stu[i].media 
               >> stu[i].english >> stu[i].math      >> stu[i].sport 
               >> stu[i].polity  >> stu[i].average;
    }
    myFile.close();
    return count;
}
 
void Input(Student stu[]) {
    system("cls");
    int i = 0;
    int flag;
    char sign = '0';
    cout << endl<<"======>>    请输入学生成绩    <<======"<<endl;
    while (sign != 'n' && sign != 'N') {
        cout << "班级：";
        cin >> stu[i].class_0;
    loop:
        cout << "学号：";
        cin >> stu[i].num;
        int c = 0;
        while (c < i) {
            c++;
            if (stu[i].num == stu[i - c].num) {
                cout << "您输入的学号已存在！请重新输入。" << endl;
                goto loop;
            }
        }
        cout << "姓名：";
        cin >> stu[i].name;
        do {
            flag = 0;
            cout << "电子技术成绩：";
            cin >> stu[i].elec;
            if (stu[i].elec > 100 || stu[i].elec < 1) {
                cout << " 对不起，请输入1-100之间的数字！！\n";
            }
            else {
                flag = 1;
            }
        } while (flag == 0);
        do {
            flag = 0;
            cout << "C++程序设计成绩：";
            cin >> stu[i].c_program;
            if (stu[i].c_program > 100 || stu[i].c_program < 1) {
                cout << " 对不起，请输入1-100之间的数字！！\n";
            }
            else {
                flag = 1;
            }
        } while (flag == 0);
        do {
            flag = 0;
            cout << "多媒体技术成绩：";
            cin >> stu[i].media;
            if (stu[i].media > 100 || stu[i].media < 1) {
                cout << " 对不起，请输入1-100之间的数字！！\n";
            }
            else {
                flag = 1;
            }
        } while (flag == 0);
        do {
            flag = 0;
            cout << "大学英语成绩：";
            cin >> stu[i].english;
            if (stu[i].english > 100 || stu[i].english < 1) {
                cout << " 对不起，请输入1-100之间的数字！！\n";
            }
            else {
                flag = 1;
            }
        } while (flag == 0);
        do {
            flag = 0;
            cout << "高等数学成绩：";
            cin >> stu[i].math;
            if (stu[i].math > 100 || stu[i].math < 1) {
                cout << " 对不起，请输入1-100之间的数字！！\n";
            }
            else {
                flag = 1;
            }
        } while (flag == 0);
        do {
            flag = 0;
            cout << "大学体育成绩：";
            cin >> stu[i].sport;
            if (stu[i].sport > 100 || stu[i].sport < 1) {
                cout << " 对不起，请输入1-100之间的数字！！\n";
            }
            else {
                flag = 1;
            }
        } while (flag == 0);
        do {
            flag = 0;
            cout << "马克思主义基本原理成绩：";
            cin >> stu[i].polity;
            if (stu[i].polity > 100 || stu[i].polity < 1) {
                cout << " 对不起，请输入1-100之间的数字！！\n";
            }
            else {
                flag = 1;
            }
        } while (flag == 0);
        stu[i].average = (stu[i].elec + stu[i].c_program + stu[i].media + stu[i].english + stu[i].math +
            stu[i].sport + stu[i].polity) / 7;
        cout << " 平均分为：" << stu[i].average<<endl;
        cout << "======>>    提示：是否继续写入学生成绩 ?(y/n)";
        cin >> sign;
        i++;
    }
    Write(stu, i);
}
 
void Statistic(Student stu[]) {
    system("cls");
    int n = Read(stu);
    cout << endl << "======>>    输出学生统计数据    <<======\n" << endl;
    cout << "---------------------------------------" << endl;
    cout << "班级" << "\t" << "学号" << "\t" << "姓名" << "\t" << "平均分" << endl;
    cout << "---------------------------------------" << endl;
    for (int i = 0; i < n; i++)
        cout << stu[i].class_0 << "\t" << stu[i].num << "\t" << stu[i].name << "\t" << stu[i].average << endl;
    cout << "---------------------------------------" << endl;
    system("pause");
}
 
void Lookup(Student stu[]) {
    system("cls");
    int n = Read(stu);
    int s;
    int i = 0;
    cout << endl << "======>>    查找学生成绩    <<======" << endl;
    cout << "请输入要查找学生的学号：";
    cin >> s;
    while ((stu[i].num - s) != 0 && i < n)i++;
    if (i == n) {
        cout << "======>>    对不起，无法找到该学生......    <<======" << endl;
    }
    else {
        cout << "----------------------------" << endl;
        cout << "班级：" << stu[i].class_0 << endl;
        cout << "学号：" << stu[i].num << endl;
        cout << "姓名：" << stu[i].name << endl;
        cout << "电子技术：" << stu[i].elec << endl;
        cout << "C++程序设计：" << stu[i].c_program << endl;
        cout << "多媒体技术：" << stu[i].media << endl;
        cout << "大学英语：" << stu[i].english << endl;
        cout << "高等数学：" << stu[i].math << endl;
        cout << "大学体育：" << stu[i].sport << endl;
        cout << "马克思主义基本原理：" << stu[i].polity << endl;
        cout << "平均分：" << stu[i].average << endl;
    }
}
 
void Modify(Student stu[]) {
    system("cls");
    int n = Read(stu);
    int s;
    int i = 0;
    cout << endl << "======>>    修改学生成绩    <<======" << endl;
    cout << "请输入要修改成绩学生的学号：";
    cin >> s;
    while ((stu[i].num - s) != 0 && i < n)i++;
    if (i == n) {
        cout << "======>>    对不起，无法找到该学生......    <<======" << endl;
    }
    else {
        cout << "------------------------------------------------------------------------------------" << endl;
        cout << "班级" << "\t" << "学号"  << "\t" << "姓名" << "\t"
             << "电子" << "\t" << "C++"  << "\t" << "多媒体" << "\t"
             << "英语" << "\t" << "数学"  << "\t" << "体育" << "\t"
             << "政治" << "\t" << "平均分" << endl;
        cout << "------------------------------------------------------------------------------------" << endl;
        cout << stu[i].class_0 << "\t" << stu[i].num       << "\t" << stu[i].name  << "\t"
             << stu[i].elec    << "\t" << stu[i].c_program << "\t" << stu[i].media << "\t"
             << stu[i].english << "\t" << stu[i].math      << "\t" << stu[i].sport << "\t"
             << stu[i].polity  << "\t" << stu[i].average   << endl;
        cout << endl << "请重新输入该学生成绩： " << endl;
        cout << "电子技术成绩：";
        cin >> stu[i].elec;
        cout << "C++成绩：";
        cin >> stu[i].c_program;
        cout << "多媒体技术成绩：";
        cin >> stu[i].media;
        cout << "大学英语成绩：";
        cin >> stu[i].english;
        cout << "高等数学成绩：";
        cin >> stu[i].math;
        cout << "大学体育成绩：";
        cin >> stu[i].sport;
        cout << "马克思主义基本原理成绩：";
        cin >> stu[i].polity;
        stu[i].average = (stu[i].elec + stu[i].c_program + stu[i].media +
            stu[i].english + stu[i].math + stu[i].sport + stu[i].polity) / 7;
        cout << "平均分：" << stu[i].average << endl;
 
        char c;
        cout << "======>>    是否保存数据 ？(y/n)";
        cin >> c;
        if (c != 'n' && c != 'N')
            Write(stu, n);
    }
}
 
void Delete(Student stu[]) {
    system("cls");
    int n = Read(stu);
    int s;
    int i = 0, j ;
    cout << endl << "======>>    删除学生成绩    <<======" << endl;
    cout << "请输入要删除的学生的学号：";
    cin >> s;
    while ((stu[i].num - s) != 0 && i < n)i++;
    if (i == n) {
        cout << "======>>    对不起，无法找到该学生......    <<======" << endl;
    }
    else {
        for (j = i; j < n - 1; j++) {
            strcpy(stu[j].class_0,stu[j + 1].class_0);
            stu[j].num = stu[j + 1].num;
            strcpy(stu[j].name, stu[j + 1].name);
            stu[j].elec = stu[j + 1].elec;
            stu[j].c_program = stu[j + 1].c_program;
            stu[j].media = stu[j + 1].media;
            stu[j].english = stu[j + 1].english;
            stu[j].math = stu[j + 1].math;
            stu[j].sport = stu[j + 1].sport;
            stu[j].polity = stu[j + 1].polity;
            stu[j].average = stu[j + 1].average;
        }
        cout << "======>>    提示：已成功删除！" << endl;
    }
    Write(stu, n - 1);
}
 
void Insert(Student stu[]) {
    system("cls");
    int n = Read(stu);
    char s='0';
    cout << endl << "=======>>    增加学生成绩    <<========" << endl;
    while (s != 'n' && s != 'N') {
        cout << "班级：";
        cin >> stu[n].class_0;
        cout << "学号：";
        cin >> stu[n].num;
        cout << "姓名：";
        cin >> stu[n].name;
        cout << "电子技术成绩：";
        cin >> stu[n].elec;
        cout << "C++成绩：";
        cin >> stu[n].c_program;
        cout << "多媒体技术成绩：";
        cin >> stu[n].media;
        cout << "大学英语成绩：";
        cin >> stu[n].english;
        cout << "高等数学成绩：";
        cin >> stu[n].math;
        cout << "大学体育成绩：";
        cin >> stu[n].sport;
        cout << "马克思主义基本原理成绩：";
        cin >> stu[n].polity;
        stu[n].average = (stu[n].elec + stu[n].c_program + stu[n].media +
            stu[n].english + stu[n].math + stu[n].sport + stu[n].polity) / 7;
        cout << "平均分：" << stu[n].average << endl;
        n++;
        cout << "======>>    是否继续插入(y/n)";
        cin >> s;
    }
    Write(stu, n);
}
 
void Sort(Student stu[]) {
    system("cls");
    int i, j, k;
    float s;
    char t[20];
    cout << endl << "======>>    降序排列    <<======" << endl;
    int n = Read(stu);
    for (i = 0; i < n-1; i++) {
        for (j = 0; j < n - 1; j++) {
            if (stu[j].average < stu[j + 1].average) {
                //交换课程
                strcpy(t, stu[j + 1].class_0);
                strcpy(stu[j + 1].class_0, stu[j].class_0);
                strcpy(stu[j].class_0, t);
                //num
                k = stu[j + 1].num;
                stu[j + 1].num = stu[j].num;
                stu[j].num = k;
 
                //name
                strcpy(t, stu[j + 1].name);
                strcpy(stu[j + 1].name, stu[j].name);
                strcpy(stu[j].name, t);
                //elec
                s = stu[j + 1].elec;
                stu[j + 1].elec = stu[j].elec;
                stu[j].elec = s;
                //c_program
                s = stu[j + 1].c_program;
                stu[j + 1].c_program = stu[j].c_program;
                stu[j].c_program = s;
                //media
                s = stu[j + 1].media;
                stu[j + 1].media = stu[j].media;
                stu[j].media = s;
                //english
                s = stu[j + 1].english;
                stu[j + 1].english = stu[j].english;
                stu[j].english = s;
                //math
                s = stu[j + 1].math;
                stu[j + 1].math = stu[j].math;
                stu[j].math = s;
                //sport
                s = stu[j + 1].sport;
                stu[j + 1].sport = stu[j].sport;
                stu[j].sport = s;
                //polity
                s = stu[j + 1].polity;
                stu[j + 1].polity = stu[j].polity;
                stu[j].polity = s;
                //average
                s = stu[j + 1].average;
                stu[j + 1].average = stu[j].average;
                stu[j].average = s;
            }
        }
    }
    cout << "------------------------------------------------------------------------------------" << endl;
    cout << "班级" << "\t" << "学号" << "\t" << "姓名" << "\t"
         << "电子" << "\t" << "C++" << "\t" << "多媒体" << "\t"
         << "英语" << "\t" << "数学" << "\t" << "体育" << "\t"
         << "政治" << "\t" << "平均分" << endl;
    cout << "------------------------------------------------------------------------------------" << endl;
    for (int i = 0; i < n; i++) {
        stu[i].order = i + 1;
        cout << stu[i].class_0 << "\t" << stu[i].num       << "\t" << stu[i].name << "\t"
             << stu[i].elec    << "\t" << stu[i].c_program << "\t" << stu[i].media << "\t"
             << stu[i].english << "\t" << stu[i].math      << "\t" << stu[i].sport << "\t"
             << stu[i].polity  << "\t" << stu[i].average   << endl;
    }
    Write(stu, n);
}
 
void Output(Student stu[]) {
    system("cls");
    int n = Read(stu);
    cout << endl << "======>>    显示全部学生成绩    <<======" << endl;
    if (!stu) {
        cout << "没有记录";
    }
    else {
        cout << "------------------------------------------------------------------------------------" << endl;
        cout << "班级" << "\t" << "学号"  << "\t" << "姓名"  << "\t" 
             << "电子" << "\t" << "C++"  << "\t" << "多媒体" << "\t" 
             << "英语" << "\t" << "数学"  << "\t" << "体育"  << "\t" 
             << "政治" << "\t" << "平均分" << endl;
        cout << "------------------------------------------------------------------------------------" << endl;
        for (int i = 0; i < n; i++) {
            cout << stu[i].class_0 << "\t" << stu[i].num       << "\t" << stu[i].name  << "\t"
                 << stu[i].elec    << "\t" << stu[i].c_program << "\t" << stu[i].media << "\t"
                 << stu[i].english << "\t" << stu[i].math      << "\t" << stu[i].sport << "\t"
                 << stu[i].polity  << "\t" << stu[i].average   << endl;
        }
        cout << "------------------------------------------------------------------------------------" << endl;
    }
}
 
int menu() {
    char c;
    do {
        system("cls");
        cout << "******************************************************" << endl;
        cout << "----------------欢迎使用学生成绩管理系统---------------" << endl;
        cout << "    *          【1】输入学生成绩                  *    " << endl;
        cout << "    *          【2】显示统计数据                  *    " << endl;
        cout << "    *          【3】查找学生成绩                  *    " << endl;
        cout << "    *          【4】修改学生成绩                  *    " << endl;
        cout << "    *          【5】删除学生成绩                  *    " << endl;
        cout << "    *          【6】插入学生成绩                  *    " << endl;
        cout << "    *          【7】按平均分排列                  *    " << endl;
        cout << "    *          【8】显示学生成绩                  *    " << endl;
        cout << "    *          【0】退出管理系统                  *    " << endl;
        cout << "******************************************************" << endl;
        cout << "请选择您的操作 (0-8):" << endl;
        c = getchar();
    } while (c < '0' || c > '8');
    return (c - '0');
}
 
int main() {
    for (;;) {
        switch (menu()) {
            case 1:
                Input(stu);
                break;
            case 2:
                Statistic(stu);
                break;
            case 3:
                Lookup(stu);
                system("pause");
                break;
            case 4:
                Modify(stu);
                system("pause");
                break;
            case 5:
                Delete(stu);
                system("pause");
                break;
            case 6:
                Insert(stu);
                system("pause");
                break;
            case 7:
                Sort(stu);
                system("pause");
                break;
            case 8:
                Output(stu);
                system("pause");
                break;
            case 0:
                cout << endl << "================感谢您使用学生成绩管理系统==============\n" << endl;
                exit(0);
        }
    }
    return 0;
}

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