学生信息管理系统c语言设计

学生信息管理系统是一种常见的应用场景，以下是一个简单的C语言设计示例：

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

#define MAX_STUDENT_NUM 100
#define MAX_NAME_LEN 20

typedef struct {
    char name[MAX_NAME_LEN];
    int age;
    int score;
} Student;

Student students[MAX_STUDENT_NUM];
int current_student_num = 0;

int add_student() {
    if (current_student_num >= MAX_STUDENT_NUM) {
        printf("Error: Student list is full!");
        return -1;
    }
    printf("Please input student name, age and score:\n");
    scanf("%s %d %d", students[current_student_num].name, &students[current_student_num].age, &students[current_student_num].score);
    current_student_num++;
    printf("Add student successfully!\n");
    return 0;
}

int delete_student(char* name) {
    int i;
    for (i = 0; i < current_student_num; i++) {
        if (strcmp(students[i].name, name) == 0) {
            break;
        }
    }
    if (i >= current_student_num) {
        printf("Error: Student not found!");
        return -1;
    }
    // Move the remaining students forward
    for (; i < current_student_num - 1; i++) {
        strcpy(students[i].name, students[i + 1].name);
        students[i].age = students[i + 1].age;
        students[i].score = students[i + 1].score;
    }
    current_student_num--;
    printf("Delete student successfully!\n");
    return 0;
}

int query_student(char* name) {
    int i;
    for (i = 0; i < current_student_num; i++) {
        if (strcmp(students[i].name, name) == 0) {
            printf("Name: %s, Age: %d, Score: %d\n", students[i].name, students[i].age, students[i].score);
            return 0;
        }
    }
    printf("Error: Student not found!");
    return -1;
}

int modify_student(char* name) {
    int i;
    for (i = 0; i < current_student_num; i++) {
        if (strcmp(students[i].name, name) == 0) {
            printf("Please input new age and score:\n");
            scanf("%d %d", &students[i].age, &students[i].score);
            printf("Modify student successfully!\n");
            return 0;
        }
    }
    printf("Error: Student not found!");
    return -1;
}

int list_students() {
    int i;
    for (i = 0; i < current_student_num; i++) {
        printf("Name: %s, Age: %d, Score: %d\n", students[i].name, students[i].age, students[i].score);
    }
    return 0;
}

int main() {
    int cmd;
    char name[MAX_NAME_LEN];
    while (1) {
        printf("Please input command (1: Add, 2: Delete, 3: Query, 4: Modify, 5: List, 6: Exit):\n");
        scanf("%d", &cmd);
        switch (cmd) {
            case 1:
                add_student();
                break;
            case 2:
                printf("Please input student name:\n");
                scanf("%s", name);
                delete_student(name);
                break;
            case 3:
                printf("Please input student name:\n");
                scanf("%s", name);
                query_student(name);
                break;
            case 4:
                printf("Please input student name:\n");
                scanf("%s", name);
                modify_student(name);
                break;
            case 5:
                list_students();
                break;
            case 6:
                exit(0);
            default:
                printf("Invalid command!\n");
                break;
        }
    }
    return 0;
}

这个示例中定义了一个结构体 `Student` 表示学生信息，并使用一个数组 `students` 存储所有学生信息。`current_student_num` 记录当前学生数目，最多不超过 `MAX_STUDENT_NUM`。主函数中使用一个循环不断读取用户输入的命令，包括添加、删除、查询、修改和列出学生信息等操作。具体实现细节详见代码注释。