Fibonacci Series C++ Program

This code will ask the user to enter the length of  the series that he want to generate, once the user will give the length then the program will generate the Fibonacci series.

#include<iostream.h>
#include<conio.h>

void main()
{
 clrscr();
 int a=0,b=1,c,r,i;
 cout<<"Enter the length:\t";
 cin>>r;
 cout<<a<<"\t"<<b<<"\t";
 for(i=0;i<r;i++)
 {
  c=a+b;
  cout<<c<<"\t";
  a=b;
  b=c;
 }
 getch();
}