学生成绩管理系统的代码

以下是一个简单的学生成绩管理系统的代码示例：

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

struct student {
    int num;
    char name[20];
    float pingshi;
    float shiyan;
    float kaoshi;
};

void inputStudent(struct student *s) {
    printf("请输入学生的学号：");
    scanf("%d", &(s->num));
    printf("请输入学生的姓名：");
    scanf("%s", s->name);
    printf("请输入学生的平时成绩：");
    scanf("%f", &(s->pingshi));
    printf("请输入学生的实验成绩：");
    scanf("%f", &(s->shiyan));
    printf("请输入学生的考试成绩：");
    scanf("%f", &(s->kaoshi));
}

void printStudent(struct student s) {
    printf("学号：%d\n", s.num);
    printf("姓名：%s\n", s.name);
    printf("平时成绩：%.2f\n", s.pingshi);
    printf("实验成绩：%.2f\n", s.shiyan);
    printf("考试成绩：%.2f\n", s.kaoshi);
}

void searchStudent(struct student *students, int count, int num) {
    int i;
    for (i = 0; i < count; i++) {
        if (students[i].num == num) {
            printStudent(students[i]);
            return;
        }
    }
    printf("未找到该学生！\n");
}

void printAllStudents(struct student *students, int count) {
    int i;
    for (i = 0; i < count; i++) {
        printStudent(students[i]);
        printf("\n");
    }
}

void modifyStudent(struct student *students, int count, int num) {
    int i;
    for (i = 0; i < count; i++) {
        if (students[i].num == num) {
            inputStudent(&(students[i]));
            printf("修改成功！\n");
            return;
        }
    }
    printf("未找到该学生！\n");
}

void deleteStudent(struct student *students, int *count, int num) {
    int i, j;
    for (i = 0; i < *count; i++) {
        if (students[i].num == num) {
            for (j = i; j < *count - 1; j++) {
                students[j] = students[j + 1];
            }
            (*count)--;
            printf("删除成功！\n");
            return;
        }
    }
    printf("未找到该学生！\n");
}

int main() {
    struct student students[100];
    int count = 0;
    int choice;
    int num;

    while (1) {
        printf("学生成绩管理系统\n");
        printf("1. 录入学生信息\n");
        printf("2. 查询学生信息\n");
        printf("3. 查询全部学生信息\n");
        printf("4. 修改学生信息\n");
        printf("5. 删除学生信息\n");
        printf("6. 退出系统\n");
        printf("请输入您的选择：");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                inputStudent(&(students[count]));
                count++;
                printf("录入成功！\n");
                break;
            case 2:
                printf("请输入要查询的学生学号：");
                scanf("%d", &num);
                searchStudent(students, count, num);
                break;
            case 3:
                printAllStudents(students, count);
                break;
            case 4:
                printf("请输入要修改的学生学号：");
                scanf("%d", &num);
                modifyStudent(students, count, num);
                break;
            case 5:
                printf("请输入要删除的学生学号：");
                scanf("%d", &num);
                deleteStudent(students, &count, num);
                break;
            case 6:
                printf("退出系统！\n");
                exit(0);
            default:
                printf("无效的选择！\n");
                break;
        }
    }

    return 0;
}