写一个员工管理系统c语言代码

以下是一个简单的员工管理系统的C语言代码，包含了基本的员工信息录入、查询和修改功能：

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

#define MAX_NUM_EMPLOYEES 100

struct Employee {
    char name[50];
    int id;
    float salary;
};

int num_employees = 0;
struct Employee employees[MAX_NUM_EMPLOYEES];

int add_employee() {
    if (num_employees >= MAX_NUM_EMPLOYEES) {
        printf("Error: Maximum number of employees exceeded.\n");
        return 0;
    }

    struct Employee new_employee;

    printf("Enter employee name: ");
    scanf("%s", new_employee.name);

    printf("Enter employee ID: ");
    scanf("%d", &new_employee.id);

    printf("Enter employee salary: ");
    scanf("%f", &new_employee.salary);

    employees[num_employees++] = new_employee;

    printf("Employee added successfully.\n");

    return 1;
}

int find_employee(int id) {
    for (int i = 0; i < num_employees; i++) {
        if (employees[i].id == id) {
            return i;
        }
    }

    return -1;
}

int search_employee() {
    int id;
    printf("Enter employee ID: ");
    scanf("%d", &id);

    int index = find_employee(id);

    if (index == -1) {
        printf("Error: Employee not found.\n");
        return 0;
    }

    printf("Employee name: %s\n", employees[index].name);
    printf("Employee ID: %d\n", employees[index].id);
    printf("Employee salary: %.2f\n", employees[index].salary);

    return 1;
}

int update_employee() {
    int id;
    printf("Enter employee ID: ");
    scanf("%d", &id);

    int index = find_employee(id);

    if (index == -1) {
        printf("Error: Employee not found.\n");
        return 0;
    }

    struct Employee updated_employee;

    printf("Enter new employee name: ");
    scanf("%s", updated_employee.name);

    printf("Enter new employee ID: ");
    scanf("%d", &updated_employee.id);

    printf("Enter new employee salary: ");
    scanf("%f", &updated_employee.salary);

    employees[index] = updated_employee;

    printf("Employee updated successfully.\n");

    return 1;
}

int main() {
    int choice;

    do {
        printf("\nEmployee Management System\n");
        printf("--------------------------\n");
        printf("1. Add Employee\n");
        printf("2. Search Employee\n");
        printf("3. Update Employee\n");
        printf("4. Exit\n");
        printf("--------------------------\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_employee();
                break;
            case 2:
                search_employee();
                break;
            case 3:
                update_employee();
                break;
            case 4:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice. Please try again.\n");
                break;
        }
    } while (choice != 4);

    return 0;
}

该代码定义了一个`Employee`结构体，其中包含了员工的姓名、ID和薪水信息。该程序支持添加员工、查询员工和更新员工信息的功能，并使用了一个简单的菜单来帮助用户进行操作。