xor.cc

// Copyright 2014 Google Inc. All Rights Reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <cstdio>
#include <iostream>
using namespace std;

#define TRUE 1
#define FALSE 0

int main(void) {
  cout << (false ^ false ? "true" : "false") << "\n";

  cout << (FALSE ^ FALSE ? "true" : "false") << "\n";

  // != is xor
  cout << (FALSE != FALSE ? "true" : "false") << "\n";
  cout << (FALSE != TRUE ? "true" : "false") << "\n";
  cout << (TRUE != FALSE ? "true" : "false") << "\n";
  cout << (TRUE != TRUE ? "true" : "false") << "\n";

  int iFalse = 0;
  int iTrue1 = 1;
  int iTrue2 = 2;
  if (iTrue1) printf("True1!\n");
  if (iTrue2) printf("True2!\n");
  if (iTrue1 ^ iTrue2) printf("first try: XOR\n");
  if ((!iTrue1) ^ (!iTrue2)) printf("second try: XOR\n");

  cout << "xor value 0 ^ 0: " << (iFalse ^ iFalse) << "\n";
  cout << "xor value 0 ^ 1: " << (iFalse ^ iTrue1) << "\n";
  cout << "xor value 1 ^ 1: " << (iTrue1 ^ iTrue1) << "\n";
  cout << "xor value 1 ^ 2: " << (iTrue1 ^ iTrue2) << "\n";

  // Printing is still annoying.
  cout << "false: " << false << "\n"; // 0
  cout << "true: " << true << "\n"; // 1
}

/*

g++ -o xor -Wall -Wextra -O2 xor.cc -std=c++11 && ./xor
false
false
false
true
true
false
True1!
True2!
first try: XOR
xor value 0 ^ 0: 0
xor value 0 ^ 1: 1
xor value 1 ^ 1: 0
xor value 1 ^ 2: 3
false: 0
true: 1

g++ -o xor -Wall -Wextra -O2 xor.cc -std=c++98 && ./xor
false
false
false
true
true
false
True1!
True2!
first try: XOR
xor value 0 ^ 0: 0
xor value 0 ^ 1: 1
xor value 1 ^ 1: 0
xor value 1 ^ 2: 3
false: 0
true: 1
*/