isupper islower を使ってみる (C++)
C++
Published: 2019-12-21

やったこと

下記を使って大文字、小文字を判別します。

  • isupper
  • islower

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() {

    cout << isupper('e') << endl;
    cout << islower('e') << endl;

    cout << isupper('E') << endl;
    cout << islower('E') << endl;
}

出力結果

0
1
1
0

参考