2.7. Write a program that read radius of a circle and display area.

#include<stdio.h> 
#include<conio.h>
void main () 
{          

int r;       

float area
clrscr ();
printf("Radius: ");         

scanf ("d", &r);
area=3.1416*r*r;
printf("Area= %f", area);
getch();
}