Question

World::World() {
    int width = -1;
    int height = -1;

    cout << "Aby rozpoczac gre wpisz rozmiar planszy" << endl;
    cout << "Aby uruchomic domyslne romiary zostaw pole puste" << endl;

    cout << "Podaj szerokosc: ";
    // I don't see what i'm  typing and i need to press enter twice;
    cin >> width;

    cout << "Podaj wysokosc: ";
    // I don't see what i'm typing too and make my program crash
    cin >> height;

    World(height, width);
}

couts工作得很好但是cin太棒了。虽然第一个cin我看不到我在打字，我需要按两次输入; 虽然secend cin我也没有看到任何东西，当我按任意键时，程序崩溃

Answer 1

该行

 World(height, width);

构造一个临时对象并将其丢弃。当前对象的成员变量永远不会正确初始化。

简化您的代码。移动代码以获取调用它的函数的输入数据。例如，在main中使用它。

int width = -1;
int height = -1;

cout << "Aby rozpoczac gre wpisz rozmiar planszy" << endl;
cout << "Aby uruchomic domyslne romiary zostaw pole puste" << endl;

cout << "Podaj szerokosc: ";
// I don't see what i'm  typing and i need to press enter twice;
cin >> width;

cout << "Podaj wysokosc: ";
// I don't see what i'm typing too and make my program crash
cin >> height;

World w(height, width);

简化默认construtor（用真实成员变量替换heightMember和widthMember）：

World::World() : heightMember(0), widthMember(0) {}

C ++ <iostream> cin无法正常工作

1 个答案: