c++ - 正确的三元运算符格式

Question

这是我的。我不确定如何正确编写它。我试过谷歌搜索，但无济于事。请不要畏缩太多:

cout << (guess > randomNumber) ? "\nWhoops! Try again!\n You guessed higher than the random number!\n\n"
        : (guess < randomNumber) ? "\nWhoops! Try again!\n You guessed lower than the random number!\n\n"
        : "";

我想让它做的是:

    // Gives hint that inputted number is higher or lower
    // than inputted number
    if (guess > randomNumber)
        cout << "\nWhoops! Try again!"
        << " You guessed higher than the random number!\n"
        << endl;
    else if (guess < randomNumber)
        cout << "\nWhoops! Try again!"
        << " You guessed lower than the random number!\n"
        << endl;

如有任何帮助，我们将不胜感激。我只想学习如何编写更高效、更小的程序。非常感谢任何反馈。

Answer 1

在整个表达式周围放置一些括号，否则您将最终打印 bool 值:

int guess = 10;
    int randomNumber = 9;

    cout << (guess > randomNumber) ? "\nWhoops! Try again!\n You guessed higher than the random number!\n\n"
            : (guess < randomNumber) ? "\nWhoops! Try again!\n You guessed lower than the random number!\n\n"
            : "" ;

// Output: 1

正确的代码:

int guess = 10;
    int randomNumber = 9;

    cout << ( (guess > randomNumber) ? "\nWhoops! Try again!\n You guessed higher than the random number!\n\n"
            : (guess < randomNumber) ? "\nWhoops! Try again!\n You guessed lower than the random number!\n\n"
            : "" ); // Notice the brackets!

/*Output:
Whoops! Try again!
You guessed higher than the random number!*/