In our Playground, we know that age is an int, but with Int, we also can write arithmetic expressions using numbers, variables/constants, operators, and parentheses. Let's start with addition, subtraction, multiplication, and division. Add the following into Xcode:
So, sum added two integers (+ operator) together, totaling 43 in our preceding example. Then, we subtracted (- operator) sum from 32 to create a result (−11, in our example). After that, we took the result and multiplied (* operator) it by 5 (see -55 in the Results Panel). All of this is pretty basic math; however, you may have noticed something different with our division equation (/ operator). When you divide two integers, the result is the third integer. So, instead of -55 divided by 10 equals -5.5, our result was -5. To get the correct floating-point value of -5.5, we need...
