new file:   TestC

int main() {
	int rad;
   	float PI = 3.14, area, ci;

  	printf("\nEnter radius of circle: ");
   	scanf("%d", &rad);

	area = PI * rad * rad;
	printf("\nArea of circle : %f ", area);

	ci = 2 * PI * rad;
	printf("\nCircumference : %f ", ci);

   	return (0);
}