Making decisions with if and else

The C++ if and else keywords are what enable us to make decisions. We saw if in action in the previous chapter when we detected each frame whether the player had pressed the Escape key.

if (Keyboard::isKeyPressed(Keyboard::Escape))
{
window.close();
}

So far, we have seen how we can use arithmetic and assignment operators to create expressions. Now, we can see some new operators.

Logical operators

Logical operators are going to help us make decisions, by building expressions that can be tested for a value of either true or false. At first, this might seem like quite a narrow choice and insufficient for the kind of choices that might be needed in an advanced PC game. Once we dig a little deeper, we will see that you can make all the required decisions we will need, with just a few of the logical operators.

Here is a table of the most useful logical operators. Look at them and the associated examples, and then we will see how to...