Employee Record System using File Handling in C

This C Program creates employee record and update it.

Here is source code of the C Program to create employee record and update it. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Create Employee Record and Update it

```
 */
```
```
#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();
```
```
 
```
```
FILE *fp, *fp1;
```
```
int count = 0;
```
```
 
```
```
void main(int argc, char **argv)
```
```
{
```
```
    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(argv[1], "a");
```
```
            create();
```
```
            break;
```
```
        case 2:    
```
```
            fp1 = fopen(argv[1],"rb");
```
```
            display();
```
```
            break;
```
```
        case 3:    
```
```
            fp1 = fopen(argv[1], "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);
```
```
}
```

$ a.out emprec1
 
1] Create a Record
2] Display Records
3] Update Records
4] Exit
Enter your choice : 1
Enter name of employee : aaa
Enter emp id : 100 
 
Enter your choice : 1
Enter name of employee : bbb
Enter emp id : 200
 
Enter your choice : 1
Enter name of employee : ccc
Enter emp id : 300
 
Enter your choice : 1
Enter name of employee : ddd
Enter emp id : 400
 
Enter your choice : 1
Enter name of employee : eee
Enter emp id : 500 
 
Enter your choice : 2
 
100 aaa
200 bbb
300 ccc
400 ddd
500 eee
Enter your choice : 3
Enter employee id to update : 300
Enter new name of emplyee to update : cdefgh
 
Enter your choice : 2
 
100 aaa
200 bbb
300 cdefgh
400 ddd
500 eee
Enter your choice : 4

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