three way comparison code example

Example: three-way comparison

#include <compare>
#include <iostream>
 
int main() {
    double foo = -0.0;
    double bar = 0.0;
 
    auto res = foo <=> bar;
 
    if (res < 0)
        std::cout << "-0 is less than 0";
    else if (res == 0)
        std::cout << "-0 and 0 are equal";
    else if (res > 0)
        std::cout << "-0 is greater than 0";
}