演算子の評価順序が不定であることを示している例?

evaluation-order.cpp

#include <iostream>

using namespace std;

int main(){
  int i,j;
  i = 3;
  j = 5;

  // compiled with g++
  cout << "i = " << i++ << i++ << endl ; 
  //     -> 43
  cout << "i = " << ( i = j ) << ( j = 6 ) << endl;
  //     -> 66
  cout << " i = " << ( i = j ) << ( j = 6 ) << ", j = " << ( j = 7 ) << endl;
  //     -> i = 66, j = 6
  cout << " i = " << i++ << ", " << " i = " << i++ << ", " << " i = " << i++ << ", " << " i = " << i++ << i << ", " << endl;
}