#include<conio.h>
#include<process.h>
#include<stdio.h>
struct employee
{
char name[20];
long int age,empno;
long int salary;
};
void main()
{
struct employee e;
FILE *pt,*fp;
int choice;
long int temp,counter=0;
long int recsize;
fp=fopen("Emp.dat","rb+");
if(fp==NULL)
{
fp=fopen("Emp.dat","wb+");
if(fp==NULL)
{
puts("Cannot open file");
exit(1);
}
}
recsize=sizeof(e);
while(choice!=0)
{
clrscr();
printf("\n\t\t1.Add");
printf("\n\t\t2.Delete");
printf("\n\t\t3.List");
printf("\n\t\t4.Modify");
printf("\n\n\t\tEnter Your choice");
scanf("%d",&choice);
switch(choice)
{
case 1:
fseek(fp,0,SEEK_END);
printf("Enter Empno");
scanf("%ld",&e.empno);
printf("Enter Name");
scanf("%s",e.name);
printf("Enter Salary");
scanf("%ld",&e.salary);
printf("Enter Age");
scanf("%ld",&e.age);
fwrite(&e,sizeof(e),1,fp);
break;
case 2:
long int location=0;
printf("Enter Empno to modify:");
scanf("%ld",&temp);
rewind(fp);
while(fread(&e,sizeof(e),1,fp)==1)
{
if(temp==e.empno)
{
printf("Enter Empno");
scanf("%ld",&e.empno);
printf("Enter Name");
scanf("%s",e.name);
printf("Enter Salary");
scanf("%ld",&e.salary);
printf("Enter Age");
scanf("%ld",&e.age);
//location=sizeof(e)*counter;
fseek(fp,-recsize,SEEK_CUR);
fwrite(&e,recsize,1,fp);
}
counter++;
}
printf("%d counter=",counter);
break;
case 3:
rewind(fp);
while(fread(&e,sizeof(e),1,fp)==1)
{
printf("\n\nEmpno %10ld",e.empno);
printf("\nName %10s",e.name);
printf("\nSalary %10ld",e.salary);
printf("\nAge %10ld",e.age);
}
break;
}
getch();
}
}
