员工绩效管理系统c语言代码 需要有创建记录 显示所有记录 清空所有记录 保存记录到文件 从文件读取记录 查询记录 删除记录 添加记录 修改记录 绩效排名的功能

以下是一个简单的员工绩效管理系统，包括了创建记录、显示所有记录、清空所有记录、保存记录到文件、从文件读取记录、查询记录、删除记录、添加记录、修改记录和绩效排名的功能。

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

#define MAX_EMPLOYEES 100

typedef struct Employee {
    char name[20];
    int age;
    float performance;
} Employee;

Employee employees[MAX_EMPLOYEES];
int num_employees = 0;

void create_record() {
    if (num_employees == MAX_EMPLOYEES) {
        printf("Error: too many employees\n");
        return;
    }
    Employee e;
    printf("Enter name: ");
    scanf("%s", e.name);
    printf("Enter age: ");
    scanf("%d", &e.age);
    printf("Enter performance: ");
    scanf("%f", &e.performance);
    employees[num_employees] = e;
    num_employees++;
}

void display_records() {
    printf("Name\tAge\tPerformance\n");
    for (int i = 0; i < num_employees; i++) {
        printf("%s\t%d\t%.2f\n", employees[i].name, employees[i].age, employees[i].performance);
    }
}

void clear_records() {
    num_employees = 0;
}

void save_records() {
    FILE *f = fopen("employees.txt", "w");
    if (f == NULL) {
        printf("Error: could not open file for writing\n");
        return;
    }
    for (int i = 0; i < num_employees; i++) {
        fprintf(f, "%s %d %.2f\n", employees[i].name, employees[i].age, employees[i].performance);
    }
    fclose(f);
}

void load_records() {
    FILE *f = fopen("employees.txt", "r");
    if (f == NULL) {
        printf("Error: could not open file for reading\n");
        return;
    }
    Employee e;
    while (fscanf(f, "%s %d %f", e.name, &e.age, &e.performance) == 3) {
        employees[num_employees] = e;
        num_employees++;
    }
    fclose(f);
}

void search_records() {
    char name[20];
    printf("Enter name: ");
    scanf("%s", name);
    for (int i = 0; i < num_employees; i++) {
        if (strcmp(employees[i].name, name) == 0) {
            printf("Name\tAge\tPerformance\n");
            printf("%s\t%d\t%.2f\n", employees[i].name, employees[i].age, employees[i].performance);
            return;
        }
    }
    printf("Employee not found\n");
}

void delete_record() {
    char name[20];
    printf("Enter name: ");
    scanf("%s", name);
    for (int i = 0; i < num_employees; i++) {
        if (strcmp(employees[i].name, name) == 0) {
            for (int j = i; j < num_employees - 1; j++) {
                employees[j] = employees[j+1];
            }
            num_employees--;
            printf("Employee deleted\n");
            return;
        }
    }
    printf("Employee not found\n");
}

void add_record() {
    char name[20];
    printf("Enter name: ");
    scanf("%s", name);
    for (int i = 0; i < num_employees; i++) {
        if (strcmp(employees[i].name, name) == 0) {
            printf("Error: employee already exists\n");
            return;
        }
    }
    if (num_employees == MAX_EMPLOYEES) {
        printf("Error: too many employees\n");
        return;
    }
    Employee e;
    strcpy(e.name, name);
    printf("Enter age: ");
    scanf("%d", &e.age);
    printf("Enter performance: ");
    scanf("%f", &e.performance);
    employees[num_employees] = e;
    num_employees++;
}

void modify_record() {
    char name[20];
    printf("Enter name: ");
    scanf("%s", name);
    for (int i = 0; i < num_employees; i++) {
        if (strcmp(employees[i].name, name) == 0) {
            printf("Enter new age: ");
            scanf("%d", &employees[i].age);
            printf("Enter new performance: ");
            scanf("%f", &employees[i].performance);
            printf("Employee modified\n");
            return;
        }
    }
    printf("Employee not found\n");
}

void rank_records() {
    for (int i = 0; i < num_employees - 1; i++) {
        for (int j = i + 1; j < num_employees; j++) {
            if (employees[i].performance < employees[j].performance) {
                Employee tmp = employees[i];
                employees[i] = employees[j];
                employees[j] = tmp;
            }
        }
    }
    printf("Rank\tName\tPerformance\n");
    for (int i = 0; i < num_employees; i++) {
        printf("%d\t%s\t%.2f\n", i+1, employees[i].name, employees[i].performance);
    }
}

int main() {
    int choice;
    while (1) {
        printf("\nEmployee Performance Management System\n");
        printf("---------------------------------------\n");
        printf("1. Create record\n");
        printf("2. Display all records\n");
        printf("3. Clear all records\n");
        printf("4. Save records to file\n");
        printf("5. Load records from file\n");
        printf("6. Search record\n");
        printf("7. Delete record\n");
        printf("8. Add record\n");
        printf("9. Modify record\n");
        printf("10. Rank records by performance\n");
        printf("11. Exit\n");
        printf("---------------------------------------\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1: create_record(); break;
            case 2: display_records(); break;
            case 3: clear_records(); break;
            case 4: save_records(); break;
            case 5: load_records(); break;
            case 6: search_records(); break;
            case 7: delete_record(); break;
            case 8: add_record(); break;
            case 9: modify_record(); break;
            case 10: rank_records(); break;
            case 11: exit(0);
            default: printf("Invalid choice\n");
        }
    }
    return 0;
}