C++ 错误 "not declared in scope"编程第二周，

Question

这是我编程的第一周，这个项目明天到期。这是代码的重要部分:

char Keep_going;
   
cout << "What would you like to do? 'M' for menu or 'Q' for quit \n" ;
cin >> Keep_going ;

if ( Keep_going == M )
{
cout << "Returning to menu \n" ;    
}

if ( Keep_going == Q )
{
choice = -1;    
}  


}while ( choice > 0 ) ;

system ("pause");
return 0;

我不断收到错误:

'M' was not declared in this scope

'Q' was not declared in this scope

有人可以帮我解决这个问题吗？

Answer 1

通过简单地使用不带引号的字母 Q 和 M，编译器将它们视为变量。只需用引号将 Q 和 M 括起来就可以解决您的问题。例如“Q”