c语言使用宏定义π的值，输入球的半径，输出球的表面积和体积

#include <stdio.h>
#define PI 3.14159

int main()
{
double radius, volume, surface_area;
printf("Enter the radius of the sphere: ");
scanf("%lf", &radius);

volume = (4.0/3.0) * PI * radius * radius * radius;
surface_area = 4.0 * PI * radius * radius;

printf("The volume of the sphere is %lf\n", volume);
printf("The surface area of the sphere is %lf\n", surface_area);

return 0;
}