用c语言实现教师工资管理系统，带注解

教师工资管理系统是一个比较简单的系统，可以使用 C 语言来实现。下面是一个简单的教师工资管理系统的示例代码，带有注释说明。

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

#define MAX_TEACHERS 100

struct Teacher {
    char name[20];
    int salary;
};

struct Teacher teachers[MAX_TEACHERS];
int numTeachers = 0;

// 添加教师信息
void addTeacher() {
    if (numTeachers >= MAX_TEACHERS) {
        printf("Error: Too many teachers!\n");
        return;
    }

    printf("Please enter teacher's name: ");
    scanf("%s", teachers[numTeachers].name);

    printf("Please enter teacher's salary: ");
    scanf("%d", &teachers[numTeachers].salary);

    numTeachers++;
}

// 显示教师信息
void showTeachers() {
    if (numTeachers == 0) {
        printf("There are no teachers!\n");
        return;
    }

    printf("Name\tSalary\n");
    for (int i = 0; i < numTeachers; i++) {
        printf("%s\t%d\n", teachers[i].name, teachers[i].salary);
    }
}

// 计算总工资
int calculateTotalSalary() {
    int total = 0;
    for (int i = 0; i < numTeachers; i++) {
        total += teachers[i].salary;
    }
    return total;
}

int main() {
    while (1) {
        printf("\nTeacher Salary Management System\n");
        printf("1. Add teacher\n");
        printf("2. Show teachers\n");
        printf("3. Calculate total salary\n");
        printf("4. Quit\n");

        int choice;
        printf("Please enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addTeacher();
                break;
            case 2:
                showTeachers();
                break;
            case 3:
                printf("Total salary: %d\n", calculateTotalSalary());
                break;
            case 4:
                exit(0);
                break;
            default:
                printf("Invalid choice!\n");
                break;
        }
    }

    return 0;
}

该代码定义了一个 `Teacher` 结构体，包含教师的姓名和工资信息，以及一个 `teachers` 数组用于存储所有教师的信息。通过 `addTeacher` 函数可以添加教师信息，通过 `showTeachers` 函数可以显示所有教师信息，通过 `calculateTotalSalary` 函数可以计算所有教师的总工资。在 `main` 函数中，通过一个无限循环来不断接收用户输入，根据用户输入的选择来执行相应的操作。