PHP-and-MySQL/C2/Arithmatic-Operators/English-timed

Time	Narration
00:00	Welcome to this tutorial on basic Arithmetic Operators.
00:03	I'll first go through plus, minus, multiply and divide operations.
00:09	These are written as plus (+), minus (-), multiply as an asterisk (*) and divide as a forward slash (/).
00:17	So, I will have 2 variables.
00:20	I'll create a variable called "$num1" and I'll save that as value equal to 10 and "$num2" is equal to 2.
00:30	So, these are both integer numbers with no decimal point.
00:34	Okay, now, say I want to add "num1" and "num2" together.
00:40	So I echo out the answer of "$num1" added to "$num2".
00:44	Let's test it out.
00:47	So, that's "12". 10 and 2, 'num1' and 'num2'; when 10 and 2 are added, the answer is "12".
00:55	Okay. Now let's try minus. We will just replace the minus symbol there.
01:01	Refresh and that will be "8".
01:05	Now let's try multiplication. 10 times 2 is 20 and we've got "20".
01:11	Next, 10 divided by 2 is just half of 10 which is "5".
01:18	Now, what we can do is we can add something on the end of this.
01:24	So, let's say this is divided by 'num2'.
01:27	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.
01:39	So, 12 divided by 2 should give 6.
01:43	But actually what this does is, it takes 'num2' and divides it by 'num2' which will give 1 and add 'num1' to that.
01:56	So, that means, instead of 6 we will get 11.
02:00	Now, the reason for this is that division operator will always work before addition operator. The same with multiply.
02:10	Now, to solve this, we should put brackets.
02:16	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.
02:29	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.
02:39	Let's refresh that and we can see that it worked!
02:43	So, these are the basic arithmetic operators which are simple to use.
02:48	If you come across any problems, always verify your calculations with a calculator to make sure they're working.
02:55	We'll see a few more of these soon.
02:58	We'll learn about the increment arithmetic operator which increments by 1 but I'll use that a little later.
03:05	Just practice these and make sure you learn them well.
03:09	Thanks for watching. This is Arvind, dubbing for the Spoken Tutorial project.

Contributors and Content Editors

Minal, Pratik kamble, Sandhya.np14