C Lesson 50 – C Capstone Project | Dataplexa

C Capstone Project – Employee Management System

This is the final lesson of the C Programming course.

In this lesson, we build a complete working project using C, exactly the way it is done in real applications.

Project Overview

We will build a Console-Based Employee Management System.

This project uses:

Structures
Functions
File handling
Menu-driven logic
Real-world data storage

What This Project Can Do

Add employee records
View all employees
Search employee by ID
Store data permanently in a file

Complete Program Code


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

struct Employee {
    int id;
    char name[50];
    char department[30];
    float salary;
};

void addEmployee();
void viewEmployees();
void searchEmployee();

int main() {
    int choice;

    while (1) {
        printf("\n===== Employee Management System =====\n");
        printf("1. Add Employee\n");
        printf("2. View All Employees\n");
        printf("3. Search Employee by ID\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addEmployee();
                break;
            case 2:
                viewEmployees();
                break;
            case 3:
                searchEmployee();
                break;
            case 4:
                printf("Exiting program...\n");
                exit(0);
            default:
                printf("Invalid choice. Try again.\n");
        }
    }
}

Explanation of the Code

struct Employee groups employee data such as ID, name, department and salary.

The program uses a menu-driven infinite loop so the user can perform multiple operations without restarting the program.

Add Employee Function


void addEmployee() {
    struct Employee emp;
    FILE *fp = fopen("employees.dat", "ab");

    if (fp == NULL) {
        printf("File error\n");
        return;
    }

    printf("Enter Employee ID: ");
    scanf("%d", &emp.id);

    printf("Enter Name: ");
    scanf(" %[^\n]", emp.name);

    printf("Enter Department: ");
    scanf(" %[^\n]", emp.department);

    printf("Enter Salary: ");
    scanf("%f", &emp.salary);

    fwrite(&emp, sizeof(emp), 1, fp);
    fclose(fp);

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

This function writes employee data into a binary file using fwrite().

View Employees Function


void viewEmployees() {
    struct Employee emp;
    FILE *fp = fopen("employees.dat", "rb");

    if (fp == NULL) {
        printf("No records found.\n");
        return;
    }

    while (fread(&emp, sizeof(emp), 1, fp)) {
        printf("\nID: %d", emp.id);
        printf("\nName: %s", emp.name);
        printf("\nDepartment: %s", emp.department);
        printf("\nSalary: %.2f\n", emp.salary);
    }

    fclose(fp);
}

This function reads all employee records from the file and displays them.

Search Employee Function


void searchEmployee() {
    struct Employee emp;
    FILE *fp = fopen("employees.dat", "rb");
    int id, found = 0;

    if (fp == NULL) {
        printf("File not found.\n");
        return;
    }

    printf("Enter Employee ID to search: ");
    scanf("%d", &id);

    while (fread(&emp, sizeof(emp), 1, fp)) {
        if (emp.id == id) {
            printf("\nEmployee Found!");
            printf("\nName: %s", emp.name);
            printf("\nDepartment: %s", emp.department);
            printf("\nSalary: %.2f\n", emp.salary);
            found = 1;
            break;
        }
    }

    if (!found)
        printf("Employee not found.\n");

    fclose(fp);
}

Sample Output


===== Employee Management System =====
1. Add Employee
2. View All Employees
3. Search Employee by ID
4. Exit
Enter your choice: 1

Enter Employee ID: 101
Enter Name: John
Enter Department: IT
Enter Salary: 55000
Employee added successfully.

🎉 Celebrate C Completion 🎉

Mini Practice

Add update and delete employee options
Sort employees by salary
Export data to text file

Final Note

If you understand and can modify this project, you are ready for real-world C programming.

Well done on completing the C Programming course.

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