lst-0565-book.cpp
// https://godbolt.org/z/jzKfabPh3
#include <cmath> // sin, cos
constexpr double max2(double a, double b) { return a > b ? a : b; }
#define MAX2(a,b) ((a) > (b) ? (a) : (b))
int main() {
double f = max2(sin(3.141592/2), cos(3.141592/2));
double e = MAX2(sin(3.141592/2), cos(3.141592/2));
}