Welcome to this tutorial on basic arithmetic operators.
I'll first go through plus, minus, multiply and divide operations.
These are written as p lus, minus, multiply as an asterisk and divide as a forward slash.
So, I will have 2 variables.
I'll create a variable called "num1" and I'll save that as value equal to "10" and "num2" is equal to "2".
So, these are both integer numbers with no decimal point.
Okay, now, say I want to add "num1" and "num2" together.
So I echo out the answer of "num1" added to "num2".
Let's test it out.
So, that's "12". 10 and 2, num1 and num2, when 10 and 2 are added, the answer is "12".
Okay now let's try minus. We will just replace the minus symbol there.
Refresh and that will be "8".
Now lets try multiplication. 10 times 2 is 20 and we've got "20".
Next, 10 divided by 2 is just half of 10 which is "5".
Now, what we can do is we can add something on the end of this.
So, let's say this is divided by num2.
So, what I think this operation will do is, it will add "num1" and "num2", so that is 10 and 2 which will give us 12 and then 12 divided by 2.
So, 12 divided by 2 should give 6.
But actually what this does is it takes num2 and divides it by num2 which will give 1 and add num1 to that.
So, that means, instead of 6 we will get 11.
Now, the reason for this is that division operator will always work before addition operator. The same with multiply
Now, to solve this, we should put brackets.
The brackets will say - we'll take this operation first, do whatever is in here and then continue to divide by whatever this could be an integer or a variable.
So, here what it will do is num1 plus num2 which is 10 plus 2 which gives us 12 divided by 2 which should give us 6.
Let's refresh that and we can see that it worked!
So, these are the basic arithmetic operators which are simple to use.
If you come across any problems, always verify your calculations with a calculator to make sure they're working.
We'll see a few more of these soon.
We'll learn about the increment arithmetic operator which increments by 1 but I'll use that a little later.
So, practice these and make sure you learn them well.
Thanks for watching. This is Arvind dubbing for the Spoken Tutorial project.