C..2 型の格上げ -- 復習

test1.cpp

// test1.cpp
// g++ -o test1 test1.cpp

#include <iostream>
using namespace std;

int main(void)
{
  int N = 3;
  cout << 1 / N << endl;
  cout << 1.0 / N << endl;
  cout << 1 / (double) N << endl;
  cout << (double) 1 / N << endl;
  cout << double(1) / N << endl;
  cout << 1 / double(N) << endl;

  return 0;
}

test1 の結果

[katsurada-no-MacBook-Air-4:~/work/tmp] mk% ./test1
0
0.333333
0.333333
0.333333
0.333333
0.333333
[katsurada-no-MacBook-Air-4:~/work/tmp] mk%