C Program to Maintain Employee Records using File Handling

By | 01.12.2016

Maintain Employee Records using File Handling


Write a C Program to Maintain Employee Records using File Handling. Here’s simple Program to Maintain Employee Records using File Handling in C Programming Language.


Below is the source code for C Program to Maintain Employee Records using File Handling which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/*  C Program to Maintain Employee Records using File Handling  */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define size 200

struct emp
{
    int id;
    char *name;
}*emp1, *emp3;

void display();
void create();
void update();

char * arrr = "C:\\Users\\acer\\Documents\\file4.txt";

FILE *fp, *fp1;
int count = 0;

void main()
{
    int i, n, ch;

    printf("1] Create a Record\n");
    printf("2] Display Records\n");
    printf("3] Update Records\n");
    printf("4] Exit");
    while (1)
    {
        printf("\nEnter your choice : ");
        scanf("%d", &ch);
        switch (ch)
        {
        case 1:
            fp = fopen(arrr, "a");
            create();
            break;
        case 2:
            fp1 = fopen(arrr,"rb");
            display();
            break;
        case 3:
            fp1 = fopen(arrr, "r+");
            update();
            break;
        case 4:
            exit(0);
        }
    }
}

/* To create an employee record */
void create()
{
    int i;
    char *p;

    emp1 = (struct emp *)malloc(sizeof(struct emp));
    emp1->name = (char *)malloc((size)*(sizeof(char)));
    printf("Enter name of employee : ");
    scanf(" %[^\n]s", emp1->name);
    printf("Enter emp id : ");
    scanf(" %d", &emp1->id);
    fwrite(&emp1->id, sizeof(emp1->id), 1, fp);
    fwrite(emp1->name, size, 1, fp);
    count++;   // count to number of entries of records
    fclose(fp);
}

/* Display the records in the file */
void display()
{
    emp3=(struct emp *)malloc(1*sizeof(struct emp));
    emp3->name=(char *)malloc(size*sizeof(char));
    int i = 1;

    if (fp1 == NULL)
        printf("\nFile not opened for reading");
    while (i <= count)
    {
        fread(&emp3->id, sizeof(emp3->id), 1, fp1);
        fread(emp3->name, size, 1, fp1);
        printf("\n%d %s",emp3->id,emp3->name);
        i++;
    }
    fclose(fp1);
    free(emp3->name);
    free(emp3);
}

void update()
{
    int id, flag = 0, i = 1;
    char s[size];

    if (fp1 == NULL)
    {
        printf("File cant be opened");
        return;
    }
    printf("Enter employee id to update : ");
    scanf("%d", &id);
    emp3 = (struct emp *)malloc(1*sizeof(struct emp));
        emp3->name=(char *)malloc(size*sizeof(char));
    while(i<=count)
    {
        fread(&emp3->id, sizeof(emp3->id), 1, fp1);
        fread(emp3->name,size,1,fp1);
        if (id == emp3->id)
        {
            printf("Enter new name of emplyee to update : ");
            scanf(" %[^\n]s", s);
            fseek(fp1, -204L, SEEK_CUR);
            fwrite(&emp3->id, sizeof(emp3->id), 1, fp1);
            fwrite(s, size, 1, fp1);
            flag = 1;
            break;
        }
        i++;
    }
    if (flag != 1)
    {
        printf("No employee record found");
        flag = 0;
    }
    fclose(fp1);
    free(emp3->name);        /* to free allocated memory */
    free(emp3);
}

OUTPUT : :


1] Create a Record
2] Display Records
3] Update Records
4] Exit
Enter your choice : 1
Enter name of employee : codezclub
Enter emp id : 1

Enter your choice : 1
Enter name of employee : Max
Enter emp id : 2

Enter your choice : 1
Enter name of employee : John
Enter emp id : 3

Enter your choice : 2

1 codezclub
2 Max
3 John
Enter your choice : 3
Enter employee id to update : 2
Enter new name of emplyee to update : Max Payne

Enter your choice : 2

1 codezclub
2 Max Payne
3 John
Enter your choice : 4

Process returned 0

Above is the source code for C Program to Maintain Employee Records using File Handling which is successfully compiled and run on Windows System.The Output of the program is shown above .

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Category: C Programming File Handling Tags:

About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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Koushik

Are there any linked lists in this program?