C program for sorting contents of a binary file.

 Hello everyone, here is the program for sorting tha contents of a binary file containing records of various employees in ascending order according to name.

#include<stdio.h>
#include<string.h>
#include<conio.h>
#include<stdlib.h>
typedef struct emp

{
 char name[20];
 int age;
 int salary;
}emp;
const char *file="employee.dat";
void main()
{
 int i,j,n;
 long int size;
 emp e1,e2;
 FILE *fp,*ft,*fs;
 clrscr();
 printf("Enter the number of employees: ");
 scanf("%d",&n);
 printf("Enter the details of employees:\n");
 fp=fopen(file,"wb");
 size=sizeof(e1);
 for(i=1;i<=n;i++)
 {
  printf("Enter the name of %d employee: ",i);
  scanf("%s",e1.name);
  printf("Enter the age of %d employee: ",i);
  scanf("%d",&e1.age);
  printf("Enter the salary of %d employee: ",i);
  scanf("%d",&e1.salary);
  fwrite(&e1,sizeof(e1),1,fp);
  fflush(stdin);
 }
 fclose(fp);
 fp=fopen(file,"rb+");
 printf("The contents of the file are:\n");
 for(i=1;i<=n;i++)
 {
  fread(&e1,size,1,fp);
  printf("%s\t%d\t%d\n",e1.name,e1.age,e1.salary);
 }
 fclose(fp);
 fs=fopen("temps.dat","wb");
 i=1;
 while(i<=n)
 {
  fp=fopen(file,"rb");
  fread(&e1,sizeof(e1),1,fp);
  rewind(fp);
  while(fread(&e2,sizeof(e2),1,fp))
  {
   if(strcmp(e1.name,e2.name)>0)
   {
    strcpy(e1.name,e2.name);
    e1.age=e2.age;
    e1.salary=e2.salary;
   }
  }
  fwrite(&e1,sizeof(e1),1,fs);
  i++;
  ft=fopen("tempo.dat","wb");
  rewind(fp);
  while(fread(&e2,sizeof(e2),1,fp))
  {
   if(strcpy(e1.name,e2.name)!=0)
   {
    fwrite(&e2,sizeof(e2),1,ft);
   }
  }
  fclose(fp);
  fclose(ft);
  remove(file);
  rename("tempo.dat",file);
 }
 fclose(fp);
 fclose(fs);
 remove(file);
 rename("temps.dat",file);
 fp=fopen(file,"rb");
 printf("\nThe contents of file after sorting:\n");
 for(i=1;i<=n;i++)
 while(fread(&e1,size,1,fp))
  printf("%s\t%d\t%d\n",e1.name,e1.age,e1.salary);
 }
 fclose(fp);
 getch();
}

Hope you all like it. See ya soon!!!