C program to find the area of a circl, given the radius

#include <stdio.h>
#include <conio.h>
#include <math.h>
#define PI 3.142

void main()
{
float radius, area;
clrscr();

   printf("Enter the radius of a circle\n");
scanf ("%f", &radius);

area = PI * pow (radius,2);

printf ("Area of a circle = %5.2f\n", area);
}

/*-----------------------------
Output

RUN1
Enter the radius of a circle
3.2
Area of a circle = 32.17

RUN 2
Enter the radius of a circle
6
Area of a circle = 113.11

------------------------------*/