Question

我正在尝试制作一个程序来计算7种不同宽高比的用户输入数字的y分量。这可能是顶部声明中的一个简单问题，但我对c ++的经验很少。我在写xcode。谢谢！

我收到以下错误消息：

19：13：二进制表达式的操作数无效（'std :: __ 1 :: basic_istream'和''）

32：6：预期不合格的身份

    //
    //  aspect1.cpp
    //  aspectRatioCalculator
    //


    #include <iostream>

    using namespace std;

    int main()
    {

    int a;
    cout << "Enter a number to calculate its complements at multiple aspect ratios." << endl;

    cin>> a >> endl;

    int b = (a*9)/17;
    int c = (a*9)/16;
    int d = (a*5)/8;
    int e = (a*4)/5;
    int f = (a*3)/5;
    int g = (a*3)/4;
    int h = (a*2)/3;

    cout << "17:9 | " << a << ":" << b << endl;
    cout << "16:9 | " << a << ":" << c << endl;
    cout << " 8:5 | " << a << ":" << d << endl;
    cout << " 5:4 | " << a << ":" << e << endl;
    cout << " 5:3 | " << a << ":" << f << endl;
    cout << " 4:3 | " << a << ":" << g << endl;
    cout << " 3:2 | " << a << ":" << h << endl;

    }

Answer 1

std::endl是输出操纵器。它不适用于输入流（用于输入）。将此更改为cin >> a >> endl;至cin >> a; cout << endl;。

xcode在cout上“期望unqualified-id”

1 个答案: