How can I check whether multiple variables are equal to the same value?

Question

How do I compare multiple items? For example, I wish to check if all the variables A, B, and C are equal to the char \'X\' or all three are equal to \'O\'. (If 2 of them are

Answer 1

if((A == 'X' || A == 'O') && A == B && B == C)
{
    // Do whatever
}