Write a C program for Employee Record System: The main features of this project

Question

Write a C program for Employee Record System:

The main features of this project include basic file handling operations; you are to add, list, modify and delete data to/from file.

Implement following functions for employees

Add record

List record

Modify record

Delete record

You are to prompt the user for list of operations and execute the selected function until user selects to exit. Use data structures and file handling to store the records.

Sample main menu:

Sample run of add records:

Notes:

1- Code should be fully commented and structured (using functions).

2- You can only use the following in completing the program:

a- stdio.h: printf,scanf,fprintf,fscanf,gets,puts,fputs and fgets.

b-selection statements.

c-loops.

d-functions

e-pointers.

f-files.

g-strings.

Explanation / Answer

#include<stdio.h>
struct employee
{
int empid;
char name[30];
float salary;
}emp;
// FUNCTION TO INSERT RECORDS TO THE FILE
void insert()
{
FILE *fp;
fp = fopen("Record", "a");
printf("Enter the emp no :");
scanf("%d", &emp.empid);
printf("Enter the Name :");
scanf("%s", &emp.name);
printf("Enter the salary :");
scanf("%f", &emp.salary);
fwrite(&emp, sizeof(emp), 1, fp);
fclose(fp);
}
// FUNCTION TO DISPLAY RECORDS
void disp()
{
FILE *fp1;
fp1 = fopen("Record", "r");
printf(" emp Number Name salary ");
while (fread(&emp, sizeof(emp), 1, fp1))
printf(" %d %s %.2f ", emp.empid, emp.name, emp.salary);
fclose(fp1);
}
// FUNCTION TO DELETE A RECORD

void deletefile()
{
FILE *fpo;
FILE *fpt;
int r, s;
printf("Enter the emp no you want to delete :");
scanf("%d", &r);
if (avlempid(r) == 0)
printf("emp no %d is not available in the file ", r);
else
{
fpo = fopen("Record", "r");
fpt = fopen("TempFile", "w");
while (fread(&emp, sizeof(emp), 1, fpo))
{
s = emp.empid;
if (s != r)
fwrite(&emp, sizeof(emp), 1, fpt);
}
fclose(fpo);
fclose(fpt);
fpo = fopen("Record", "w");
fpt = fopen("TempFile", "r");
while (fread(&emp, sizeof(emp), 1, fpt))
fwrite(&emp, sizeof(emp), 1, fpo);
printf(" RECORD DELETED ");
fclose(fpo);
fclose(fpt);
}

}
// FUNCTION TO UPDATE THE RECORD
void update()
{
int avl;
FILE *fpt;
FILE *fpo;
int s, r, ch;
printf("Enter emp number to update:");
scanf("%d", &r);
avl = avlempid(r);
if (avl == 0)
{
printf("emp number %d is not Available in the file", r);
}
else
{
fpo = fopen("Record", "r");
fpt = fopen("TempFile", "w");
while (fread(&emp, sizeof(emp), 1, fpo))
{
s = emp.empid;
if (s != r)
fwrite(&emp, sizeof(emp), 1, fpt);
else
{
printf(" 1. Update Name of emp Number %d", r);
printf(" 2. Update salary of emp Number %d", r);
printf(" 3. Update both Name and salary of emp Number %d", r);
printf(" Enter your choice:");
scanf("%d", &ch);
switch (ch)
{
case 1:
printf("Enter Name:");
scanf("%s", &emp.name);
break;
case 2:
printf("Enter salary : ");
scanf("%f", &emp.salary);
break;
case 3:
printf("Enter Name: ");
scanf("%s", &emp.name);
printf("Enter salary: ");
scanf("%f", &emp.salary);
break;
default:
printf("Invalid Selection");
break;
}
fwrite(&emp, sizeof(emp), 1, fpt);
}
}
fclose(fpo);
fclose(fpt);
fpo = fopen("Record", "w");
fpt = fopen("TempFile", "r");
while (fread(&emp, sizeof(emp), 1, fpt))
{
fwrite(&emp, sizeof(emp), 1, fpo);
}
fclose(fpo);
fclose(fpt);
printf("RECORD UPDATED");
}
}

// FUNCTION TO CHECK GIVEN emp NO IS AVAILABLE //
int avlempid(int rno)
{
FILE *fp;
int c = 0;
fp = fopen("Record", "r");
while (!feof(fp))
{
fread(&emp, sizeof(emp), 1, fp);

if (rno == emp.empid)
{
fclose(fp);
return 1;
}
}
fclose(fp);
return 0;
}
//FUNCTION TO CHECK THE FILE IS EMPTY OR NOT
int empty()
{
int c = 0;
FILE *fp;
fp = fopen("Record", "r");
while (fread(&emp, sizeof(emp), 1, fp))
c = 1;
fclose(fp);
return c;
}
// MAIN PROGRAM
void main()
{
int c, emp;
do
{
printf(" ---Select your choice--------- ");
printf(" 1. ADD RECORDS 2. LIST RECORDS");
printf(" 3. DELETE RECORDS 4. MODIFY RECORDS");
printf(" 5. EXIT");
printf(" ------------------------------------------ ");
printf(" Enter your choice:");
scanf("%d", &c);
printf(" ");
switch (c)
{
case 1:
insert();
break;
case 2:
emp = empty();
if (emp == 0)
printf(" The file is EMPTY ");
else
disp();
break;
case 3:
deletefile();
break;
case 4:
update();
break;
case 5:
exit(1);
break;
default:
printf(" Your choice is wrong Please try again... ");
break;

}
} while (c != 7);

}

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