Employee Management System Project Using C Language

Introduction

In this series of C Projects Source Code, we'll look at how to build an Employee Management System in C. We may manage the information of workers working in a firm or organization using this Employee Management System. The file handling technique is used here to save the data in a particular file, and you get the notion of this project as soon as you hear the name.

This project uses the Insert, Edit, and Delete file actions, but the sole constraint is that you can only display the data, not search for any data item in particular. If you have more experience with C, you may alter this program by using the searching strategies.

The source code is available for download under the button below the picture; you may use it to obtain a better understanding of the project.

The following modules are included in this project.

• Add Employee Details
• Edit Employee details
• Modify Employee
• Delete Employee

Source Code for Employee Management System Project Using C Language

#include <stdio.h> ///for input output functions like printf, scanf
#include <stdlib.h>
#include <conio.h>
#include <windows.h> ///for windows related functions (not important)
#include <string.h>  ///string operations

/** List of Global Variable */
COORD coord = {0,0}; /// top-left corner of window

/**
    function : gotoxy
    @param input: x and y coordinates
    @param output: moves the cursor in specified position of console
*/
void gotoxy(int x,int y)
{
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),coord);
}

/** Main function started */

int main()
{
    FILE *fp, *ft; /// file pointers
    char another, choice;

    /** structure that represent a employee */
    struct emp
    {
        char name[40]; ///name of employee
        int age; /// age of employee
        float bs; /// basic salary of employee
    };

    struct emp e; /// structure variable creation

    char empname[40]; /// string to store name of the employee

    long int recsize; /// size of each record of employee

    /** open the file in binary read and write mode
    * if the file EMP.DAT already exists then it open that file in read write mode
    * if the file doesn't exit it simply create a new copy
    */
    fp = fopen("EMP.DAT","rb+");
    if(fp == NULL)
    {
        fp = fopen("EMP.DAT","wb+");
        if(fp == NULL)
        {
            printf("Connot open file");
            exit(1);
        }
    }

    /// sizeo of each record i.e. size of structure variable e
    recsize = sizeof(e);

    /// infinite loop continues untile the break statement encounter
    while(1)
    {
        system("cls"); ///clear the console window
        gotoxy(30,10); /// move the cursor to postion 30, 10 from top-left corner
        printf("1. Add Record"); /// option for add record
        gotoxy(30,12);
        printf("2. List Records"); /// option for showing existing record
        gotoxy(30,14);
        printf("3. Modify Records"); /// option for editing record
        gotoxy(30,16);
        printf("4. Delete Records"); /// option for deleting record
        gotoxy(30,18);
        printf("5. Exit"); /// exit from the program
        gotoxy(30,20);
        printf("Your Choice: "); /// enter the choice 1, 2, 3, 4, 5
        fflush(stdin); /// flush the input buffer
        choice  = getche(); /// get the input from keyboard
        switch(choice)
        {
        case '1':  /// if user press 1
            system("cls");
            fseek(fp,0,SEEK_END); /// search the file and move cursor to end of the file
            /// here 0 indicates moving 0 distance from the end of the file

            another = 'y';
            while(another == 'y')  /// if user want to add another record
            {
                printf("\nEnter name: ");
                scanf("%s",e.name);
                printf("\nEnter age: ");
                scanf("%d", &e.age);
                printf("\nEnter basic salary: ");
                scanf("%f", &e.bs);

                fwrite(&e,recsize,1,fp); /// write the record in the file

                printf("\nAdd another record(y/n) ");
                fflush(stdin);
                another = getche();
            }
            break;
        case '2':
            system("cls");
            rewind(fp); ///this moves file cursor to start of the file
            while(fread(&e,recsize,1,fp)==1)  /// read the file and fetch the record one record per fetch
            {
                printf("\n%s %d %.2f",e.name,e.age,e.bs); /// print the name, age and basic salary
            }
            getch();
            break;

        case '3':  /// if user press 3 then do editing existing record
            system("cls");
            another = 'y';
            while(another == 'y')
            {
                printf("Enter the employee name to modify: ");
                scanf("%s", empname);
                rewind(fp);
                while(fread(&e,recsize,1,fp)==1)  /// fetch all record from file
                {
                    if(strcmp(e.name,empname) == 0)  ///if entered name matches with that in file
                    {
                        printf("\nEnter new name,age and bs: ");
                        scanf("%s%d%f",e.name,&e.age,&e.bs);
                        fseek(fp,-recsize,SEEK_CUR); /// move the cursor 1 step back from current position
                        fwrite(&e,recsize,1,fp); /// override the record
                        break;
                    }
                }
                printf("\nModify another record(y/n)");
                fflush(stdin);
                another = getche();
            }
            break;
        case '4':
            system("cls");
            another = 'y';
            while(another == 'y')
            {
                printf("\nEnter name of employee to delete: ");
                scanf("%s",empname);
                ft = fopen("Temp.dat","wb");  /// create a intermediate file for temporary storage
                rewind(fp); /// move record to starting of file
                while(fread(&e,recsize,1,fp) == 1)  /// read all records from file
                {
                    if(strcmp(e.name,empname) != 0)  /// if the entered record match
                    {
                        fwrite(&e,recsize,1,ft); /// move all records except the one that is to be deleted to temp file
                    }
                }
                fclose(fp);
                fclose(ft);
                remove("EMP.DAT"); /// remove the orginal file
                rename("Temp.dat","EMP.DAT"); /// rename the temp file to original file name
                fp = fopen("EMP.DAT", "rb+");
                printf("Delete another record(y/n)");
                fflush(stdin);
                another = getche();
            }
            break;
        case '5':
            fclose(fp);  /// close the file
            exit(0); /// exit from the program
        }
    }
    return 0;
}

Output

Final Words

We construct an employment management system in this C Projects source code series (EMS). We can keep track of the information of a company's or organization's personnel. As soon as you hear the name, you'll have an idea of what this project is about. A file handling mechanism is used to save the data in a specified file.