#include <iostream>
 
int main(int, const char**)
{
unsigned a = 123;
unsigned b = 42;
 
int c = 123;
int d = 42;
 
 
const auto res1 = a - b;
const auto res2 = b - a;
 
const char chRes1 = 123-42;
const char chRes2 = 42-123;
 
const auto res3 = c - d;
const auto res4 = d - c;
 
std::cout << "a - b = " << res1 << ", b - 1 = " << res2 << std::endl;
std::cout << "c - d = " << res3 << ", d - c = " << res4 << std::endl;
std::cout << std::boolalpha << "res1 == res2 = " << (res1==res3) << ", res2 == res4 = " << (res2==res4) << std::endl;
 
std::cout << std::boolalpha << "res2 = " << res2 << ", chRes2 = " << chRes2 << std::endl;
std::cout << std::boolalpha << "res1 == chRes1 = " << (res1==chRes1) << ", res2 == chRes2 = " << (res2==chRes2) << std::endl;
}

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