constant_folding.c

//courtesy of MIT Open Courseware (https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-172-performance-engineering-of-software-systems-fall-2018/lecture-slides/MIT6_172F18_lec2.pdf)
#include <math.h>

void orrery (){
  const double radius = 6371000.0;
  const double diameter = 2 * radius;
  const double circumference  = M_PI * diameter;
  const double cross_area = M_PI * radius * radius;
  const double surface_area = circumference * diameter;
}