#include <stdio.h>
 
void area_circum(double radius, double *area, double *circum);
 
int main(void) {
	double radius, area, circum;
 
    printf("Please enter the radius of the circle: ");
    scanf("%lf", &radius);
 
    area_circum(radius, &area, &circum);
 
    printf("Area of circle : %0.4f\n", area);
 
    return 0;
}
 
 
void area_circum(double radius, double *area, double *circum) {
    double PIE = 3.141592653589793;
 
	*area = PIE * radius * radius;
	*circum = PIE * 2 * radius;
}

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