用c语言写一个学生综合测评系统

好的，下面是一个简单的学生综合测评系统的C语言代码：

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

#define MAX_STUDENT 100

struct Student {
    int id;
    char name[20];
    int score1;
    int score2;
    int score3;
    float average;
};

int main() {
    struct Student students[MAX_STUDENT];
    int num = 0;
    int option;

    while (1) {
        printf("\n\n");
        printf("1. Add student record\n");
        printf("2. Delete student record\n");
        printf("3. View student record\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &option);

        switch (option) {
            case 1:
                if (num >= MAX_STUDENT) {
                    printf("Error: Maximum number of students exceeded.\n");
                    break;
                }

                printf("Enter student ID: ");
                scanf("%d", &students[num].id);

                printf("Enter student name: ");
                scanf("%s", students[num].name);

                printf("Enter score 1: ");
                scanf("%d", &students[num].score1);

                printf("Enter score 2: ");
                scanf("%d", &students[num].score2);

                printf("Enter score 3: ");
                scanf("%d", &students[num].score3);

                students[num].average = (students[num].score1 + students[num].score2 + students[num].score3) / 3.0;

                num++;
                break;

            case 2:
                if (num == 0) {
                    printf("Error: No students in the system.\n");
                    break;
                }

                int delete_id;
                printf("Enter student ID to be deleted: ");
                scanf("%d", &delete_id);

                int delete_index = -1;
                for (int i = 0; i < num; i++) {
                    if (students[i].id == delete_id) {
                        delete_index = i;
                        break;
                    }
                }

                if (delete_index == -1) {
                    printf("Error: Student with ID %d not found.\n", delete_id);
                    break;
                }

                for (int i = delete_index; i < num - 1; i++) {
                    students[i] = students[i + 1];
                }

                num--;
                printf("Student with ID %d deleted successfully.\n", delete_id);
                break;

            case 3:
                if (num == 0) {
                    printf("Error: No students in the system.\n");
                    break;
                }

                printf("ID\tName\tScore 1\tScore 2\tScore 3\tAverage\n");
                for (int i = 0; i < num; i++) {
                    printf("%d\t%s\t%d\t%d\t%d\t%.2f\n", students[i].id, students[i].name, students[i].score1, students[i].score2, students[i].score3, students[i].average);
                }
                break;

            case 4:
                printf("Goodbye!\n");
                exit(0);

            default:
                printf("Error: Invalid option selected.\n");
        }
    }

    return 0;
}

这个程序使用了一个结构体 `Student` 来存储学生的信息，包括学生ID、姓名、三门科目的成绩以及平均分。通过一个循环菜单，用户可以选择添加学生记录、删除学生记录、查看学生记录或退出程序。在每个选项中，程序都会有相应的输入和输出操作。