PHP: Commutative operation
We learn this in grade one: two plus three is the same as three plus two. This is one of the basic laws of arithmetics that we know intuitively. It's called a commutative property of an operation.
A binary operation is commutative if changing the order of operands doesn't affect the outcome. Obviously, addition is commutative:
3 + 2 = 2 + 3.
Is subtraction commutative? Of course not:
2 - 3 ≠ 3 - 2. Operators in programming follow the same rules.
Actually, most of the operations you'll use aren't commutative. So make you pay attention to the order of operands.
Write a program, that calculates and prints to screen results of the following mathematical expressions: "3 to the power of 5" and "-8 divided by -4".
The results will be displayed together, on a single line without any spaces between them. We'll learn how to fix this problem later.
Commutativity - property of an operation: changing the order of the operands does not change the result. E.g. addition is a commutative operation.
Please sign in with your GitHub account, this is necessary to track the progress of the lessons. If you do not have an account yet, now is the time to create an account on GitHub.