整数かどうかを確かめる (C++)
C++
Published: 2019-12-15

やったこと

値が整数かどうかをみます。

確認環境

$ g++ --version
g++ (Homebrew GCC 9.2.0) 9.2.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

調査

test.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {
    double d1 = pow(3, 0.5);
    double d2 = 2.0;

    cout << (d1 == floor(d1)) << endl;
    cout << (d2 == floor(d2)) << endl;
}

出力結果

0
1

参考