c++ - 'element' 的初始化被 'case' 标签跳过

Question

我不明白为什么会出现错误:

initialization of 'element' is skipped by 'case' label.

谁能给我解释一下？

void LinkedList::process_example(int choice) {
    switch(choice) {
    case 1:
        cout << endl << endl << "Current S = ";
        this->printSet();

        cout << "Enter an element :";
        char* element = "lol";

        //cin>>element;
        cin.clear();
        cin.ignore(200, '\n');

        this->Addelementfromback(element); //error is here
        cout << endl << endl << "Current S = ";

        this->printSet();
        break;

    case 2:
        this->check_element();
        break;

    case 3:
        cout << endl << endl;
        cout << "Current Set S = ";
        this->printSet();

        cout << endl << "S has ";
        int count = this ->check_cardinality();
        cout << count << " elements";
        break;
    }
}

Answer 1

尝试用 {} 包裹 case，并将所有语句放入 {}。

case 1:
{
   cout << endl << endl << "Current S = ";
   this->printSet();    
   // and other mess
}
break;

你应该把所有这些语句放在函数中，保持case语句清晰。比如写成这样的样式:

case 1:
   initializeElement();
   break;
case 2:
   doSomethingElse();
   break;

见 link