验证Char功能

Question

SoI必须能够验证用户输入，并确保它是因为某种原因它不会给我，它是垃圾邮件正在while循环..请help.Thanks

char getCharChoice(string message, char y, char n) 
{ 
char choice; 

// Print the message and get the input 
cout<<message<< " "; 
cin>>choice; 
// Check for valid input 
while (choice != y || choice != n) 
{ 

    cin.clear(); // reset the input stream 
    cin.ignore(5000, '\n'); // take any remaining input off the stream 

    // Ask for a choice and read user input 
cout << "Not a valid input please: Choose y or n: "; 
    cin >> choice; 
} 


return choice; 
} 

Answer 1

你想要“while（choice！= y & & choice！= x）”，这是一个逻辑同义反复。