c++ - switch 语句多字符常量

Question

我正在尝试将其转换为 switch 语句

if (codeSection == 281)
    cout << "bigamy";
else if (codeSection == 321  ||  codeSection == 322)
    cout << "selling illegal lottery tickets";
else if (codeSection == 383)
    cout << "selling rancid butter";
else if (codeSection == 598)
    cout << "wounding a bird in a public cemetery";
else
    cout << "some other crime";

// Actual switch statement
switch (codeSection)
{
    case '281':
        cout << "bigamy" << endl;
        break;

    case '321':
    case '322':
        cout << "selling illegal lottery tickets" << endl;
        break;

    case '383':
        cout << "selling rancid butter" << endl;
        break;

    case '598':
        cout << "wounding a bird in a public cemetery";
        break;

    default:
        cout << "some other crime"<< endl;

}

编译器说 switch 语句多字符常量，并给我一个黄色警告但仍然可以编译。我的问题是这种情况应该只采用 char 形式吗？像案例'2'

Answer 1

case '281':

应该是

case 281:

其余部分也类似，否则编译器“认为”您尝试使用多字符常量，这可能不是您想要的。

case 不必是 char。事实上，它必须是与转换和整数提升后的条件类型相同类型的常量表达式，参见例如http://en.cppreference.com/w/cpp/language/switch .