案例“p"的问题||'P':C++ 中 switch 语句中的语法

I've used the switch statement the following way:

   switch (ch){
   case 'P' || 'p': 
        goto balance;
        break;

   case 'r' || 'R':
        goto menu;
        break;

   default:
           cout<<"		Invalid Choice!!"<<endl;
           system ("		pause");
           system ("cls");
           goto menu;
           break;
           }

但下面的语法似乎有问题:

case 'r' || 'R'

case 'P':
case 'p': 
    goto balance;
    break;