Accept Radius & Produce Area

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 //prg to accept radius and produce area  
 //Downloaded From www.c4cpp.co.nr. (C)2009.All rights reserved.  
 #include<iostream.h>  
 #include<conio.h>  
 void main()  
 {  
 clrscr();  
 float r,ar;  
 cout<<"Enter radius"<<endl;  
 cin>>r;  
 ar =(22/7)*r*r;  
 cout<<"Area = "<<ar;  
 getch();  
 }