conditional statement in while loop

Question

I must have missed something. I\'m doing an exercise to learn c++ and it asks that if a user inputs either c,p,t or g character then carry on, otherwise re-request prompt, so I

Answer 1

My understanding is that the "OR" statement should work as one of the tests is correct.

Well, you could use ||, but the expression would have to be:

while(!(ch == 'c' || ch == 'p' || ch == 't' || ch == 'g'));

By applying the De Morgan's law, the above simplifies to:

while(ch != 'c' && ch != 'p' && ch != 't' && ch != 'g');