how to return to beginning of the case if user press wrong Character?

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#include <string>
#include <cmath>
using namespace std;

int main(){
int score = 0;
int count = 0;
char answer;
int r=1;

cout<<"please use small letter to answer"<<endl;

case 1:
cout << "answer #1? " << endl;
cin >> answer;
if (answer == 'b')
cout << "Correct" << endl;
else if(answer=='a'||answer=='c'||answer=='d')
cout << "Incorrect" << endl;
cout << "The correct answer is B" << endl;
cout<<"enter valid char"<<endl;

I'm trying to make multiple choice programming
I'm confusing about input validation
I want answer only accept a, b ,c or d,
and if I put wrong words or number I want to repeat the case 1 until user put a, b ,c or d.
What should I add on this code?

Last edited on
while ( cin >> answer && ! ('a'==answer||...) )
    cout << "You must answer one of a, b, c, or d.  Try again:" << endl;

Or something like that. The main thing is the use of loop that repeats until something.
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