c++ - QString::toInt()如何转换非数字字符串？

Question

我正在读我的一本教科书，在解释它引入的代码方面做得很差。这里是示例代码:

int choice;
QString response;
do {
 cout << READ << ". Read data from a file.\n"
 << ADD << ". Add items to the Library.\n"
 << FIND << ". Find and display an item.\n"
 << REMOVE << ". Remove an item from the Library.\n"
 << SAVE << ". Save the Library list to a file.\n"
 << LIST << ". Brief listing of Library items.\n"
 << QUIT << ". Exit from this program.\n"
 << "Your choice: " << flush;
 response = cin.readLine();
 choice = response.toInt();
} while(choice < READ or choice > QUIT)

Answer 1

根据QT Documentation，

Returns 0 if the conversion fails.

这意味着，如果字符串不是数字，它将返回0。