c++ 判断是元音还是辅音

#include <iostream>
using namespace std;

int main()
{
    char c;
    int isLowercaseVowel, isUppercaseVowel;

    cout << "输入一个字母: ";
    cin >> c;

    // 小写字母元音
    isLowercaseVowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');

    // 大写字母元音
    isUppercaseVowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');

    // if 语句判断
    if (isLowercaseVowel || isUppercaseVowel)
        cout << c << " 是元音";
    else
        cout << c << " 是辅音";

    return ;
}