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
}

Answer 2

Just for variety:

template <typename T, typename U>
bool allequal(const T &t, const U &u) {
    return t == u;
}

template <typename T, typename U, typename... Others>
bool allequal(const T &t, const U &u, Others const &... args) {
    return (t == u) && allequal(u, args...);
}

if (allequal(a,b,c,'X') || allequal(a,b,c,'O')) { ... }

Answer 3

Just seperate them and test them one by one:

if (A == 'O' && B == 'O' && C == 'O' || A == 'X' && B == 'X' && C == 'X')
    // etc