unsigned型の引き算 ref: http://qiita.com/abedominal/items/34c11e712c88c0d66fb4

file0.cpp

#include <string>
#include <iostream>
#include <chrono>
#include <cstdint>
#include <cmath>
using namespace std;


void checkDiff(uint32_t l, uint32_t r, bool isLeftBigger)
{
    int a = l - r;
    int b = r - l;
    if (a < b && isLeftBigger)
    {
        cout << a << " is smaller than " << b << endl;
    }
    else if (a > b && !isLeftBigger)
    {
        cout << a << " is larger than " << b << endl;
    }
    else
    {
        cout << "OK" << endl;

    }
}

int main(int argv, char* argc[])
{
    checkDiff(UINT_MAX, UINT_MAX - 1, true);
    checkDiff(UINT_MAX - 1, UINT_MAX, false);
    checkDiff(UINT_MAX, 0, true);
    checkDiff(UINT_MAX, 1, true);
    checkDiff(0x7FFFFFFFU, 0xFFFFFFFFU, false);
    return 0;
}

file1.txt

OK
OK
-1 is smaller than 1
-2 is smaller than 2
OK
続行するには何かキーを押してください . . .