Conditional Operator

c ? x : y If conditional c is true then evaluate x, otherwise evaluate y Its a shorthand C Conditional Statements It also counts as an expression, so you can use it with a similar purpose as a lambda function

constexpr bool inBigClassroom { false };
    constexpr int classSize { inBigClassroom ? 30 : 20 };
    std::cout << "The class size is: " << classSize << '\n';