// File: demo.cxx
// Showing details of binary numbers
//
// CSCI 2270
// Karl Winklmann
// Fall 2002

#include <iostream>
#include <cstdlib>
#include <stdio.h>

void testIfEqual (unsigned int ui, int si);

int main()
{
    system ("type demo.cxx"); // show this program

    unsigned int ui = 2;
    int si = 2; // 'int' by itself means 'signed', i.e.
                // there can be positive and negative values

    testIfEqual (ui, si);

    getchar (); // wait for Enter key

    ui = ui - 7;
    si = si - 7;

    testIfEqual (ui, si);

    return EXIT_SUCCESS;
}

void testIfEqual (unsigned int ui, int si)
{
    if (ui == si)
        cout << endl << "Yes, " << ui << " == " << si << endl;
    else
        cout << endl << "No, " << ui << " != " << si << endl;

    // showing the actual bits
    cout << "unsigned int = ";
    for (int b = 31; b >= 0; b--)
        cout << ((ui >> b) & 1);

    cout << endl;

    cout << "(signed) int = ";
    for (int b = 31; b >= 0; b--)
        cout << ((si >> b) & 1);
}

------------------------------------------------------------------

Yes, 2 == 2
unsigned int = 00000000000000000000000000000010
(signed) int = 00000000000000000000000000000010

Yes, 4294967291 == -5
unsigned int = 11111111111111111111111111111011
(signed) int = 11111111111111111111111111111011