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Write a program to calculate Area of circle. 

// Write a program to calculate Area of circle.
 
 
#include<stdio.h>  
#include<conio.h>
#define pi 3.14  
 void main()  
 {  
 int r,area=0;
 clrscr();  
 printf("Enter radius of circle:\n");  
 scanf("%d",&r);  
 area=pi*r*r;  
 printf("Area of circle is %d",area);  
 getch();  
 }  
 
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