#include 
     
      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 0;}