如何不使if语句“联系起来”与else语句

我做一个简单的程序来问你，如果你想比萨饼：如何不使if语句“联系起来”与else语句

#include <iostream> 

    using namespace std; 

    int main() 
{ 
    char answer; 
    cout << "Yes or no, would you like some pizza?: "; 
    cin >> answer; 
    cout << endl; 
    if ((answer == 'n') || (answer == 'N')) { 
     cout << "Have some anyway."; 
    } 
    if ((answer == 'y') || (answer == 'Y')) { 
     cout << "Okay, here's your pizza!"; 
    } 
    else { 
    cout << "Huh? Give me a proper answer."; 
    } 
    cout << endl << endl; 
    return 0; 
}

如果你键入“是”或任何与开始Y返回“这是你的披萨”。问题是如果你输入任何以n开头的东西，它会说“有一些东西”，“呃？给我一个正确的答案”。

我试图用另一种“如果”是去

if ((answer != 'n') || (answer !='N')) { 
    cout << "Give me a proper answer"; 
}

，做，对于在if语句每个字母，但同样的问题时...帮助更换else语句？

来源

2014-12-04 Westi

'if（a）{A} else if（b）{B} else if（c）{C} else {D}' – Angew 2014-12-04 09:55:20

是你在找什么？

#include <iostream> 

using namespace std; 

int main() 
{ 
    char answer; 
    cout << "Yes or no, would you like some pizza?: "; 
    cin >> answer; 
    cout << endl; 
    if ((answer == 'n') || (answer == 'N')) { 
     cout << "Have some anyway."; 
    } 
    else if ((answer == 'y') || (answer == 'Y')) { 
     cout << "Okay, here's your pizza!"; 
    } 
    else { 
     cout << "Huh? Give me a proper answer."; 
    } 
    cout << endl << endl; 
    return 0; 
}

之前发生了什么事，是下面的代码被执行，即使((answer == 'n') || (answer == 'N'))是真的：

if ((answer == 'y') || (answer == 'Y')) { 
    cout << "Okay, here's your pizza!"; 
} 
else { 
cout << "Huh? Give me a proper answer."; 
}

...这就是为什么我们不得不写else if代替if，因此，上述代码仅在((answer == 'n') || (answer == 'N'))为假时执行。

来源

2014-12-04 09:56:04

工作，谢谢！ – Westi 2014-12-04 09:58:17

这个答案没有解释什么是错的，它是如何修复的。 – anatolyg 2014-12-04 10:07:35

@anatolyg：固定，谢谢你的推荐！ – 2014-12-04 16:08:59

使用else if，而不是第二if

if ((answer == 'n') || (answer == 'N')) { 
    cout << "Have some anyway."; 
} 
else if ((answer == 'y') || (answer == 'Y')) { 
    cout << "Okay, here's your pizza!"; 
} 
else { 
cout << "Huh? Give me a proper answer."; 
}

来源

2014-12-04 09:58:23 hwg

if (condition == true) {/*do this*/} 
else if (other_condition == true) {/*do that*/} //repeat as much as you like 
else {/*do other stuff*/}

或者使用switch语句：

switch(answer) { 
case 'y': case 'Y': /*do this*/ break; 
case 'n': case 'N': /*do that*/ break; 
/*do other stuff*/ 
}

来源

2014-12-04 09:58:23 Noel

尝试使用否则，如果在第二个if语句......像

else if ((answer == 'y') || (answer == 'Y')) { 
     cout << "Okay, here's your pizza!"; 
    }

其他一切都很好

来源

2014-12-04 10:02:13 rydz

如何不使if语句“联系起来”与else语句

回答

相关问题