Count no of records in a File

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 //Downloaded From www.c4cpp.co.nr  
 //(C)2009.All rights reserved.  
 #include<iostream.h>  
 #include<conio.h>  
 #include<dos.h>  
 #include<stdio.h>  
 #include<fstream.h>  
 struct stud  
 {  
 char name[50];  
 int rno;  
 };  
 void main()  
 {  
 clrscr();  
 stud st;  
 int i;  
 ofstream gpj("abcabc.dat",ios::binary|ios::trunc);  
 if(!gpj)  
 {cout<<"File Cannot Be Created"<<endl;  
 }  
 else  
 {  
 int n;  
 cout<<"How many Students U Want to Enter ???? "<<endl;  
 cin>>n;  
 for(i=0;i<n;i++)  
 {  
 cout<<"Enter Name"<<endl;  
 gets(st.name);  
 cout<<"Enter Roll No"<<endl;  
 cin>>st.rno;  
 gpj.write((char*)&st,sizeof(st));  
 }gpj.close();  
 }  
 int a=0;  
 ifstream gp("abcabc.dat",ios::binary);  
 if(!gp)  
 {  
 cout<<"File Error"<<endl;  
 }  
 else  
 {  
 gp.seekg(0);  
 while(gp.read((char*)&st,sizeof(st)))  
 {  
 a++;  
 }  
 cout<<"No = "<<a;  
 gp.close();  
 }  
 getch();  
 }