Chandrika: Created page with '{|Border=1 !Time !Narration |- |0:00 |Welcome to this tutorial on basic arithmetic operators. |- |0:03 |I'll first go through plus, minus, multiply and divide operations. |- |0:0…'

2012-11-29T06:31:14Z

Created page with '{|Border=1 !Time !Narration |- |0:00 |Welcome to this tutorial on basic arithmetic operators. |- |0:03 |I'll first go through plus, minus, multiply and divide operations. |- |0:0…'

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{|Border=1
!Time
!Narration
|-
|0:00
|Welcome to this tutorial on basic arithmetic operators.
|-
|0:03
|I'll first go through plus, minus, multiply and divide operations.
|-
|0:09
|These are written as p lus, minus, multiply as an asterisk and divide as forward slash.
|-
|0:16
|So, I will have 2 variables.
|-
|0:19
|I'll create a variable called "num1" and I'll save that as value equal to "10" and "num2" is equal to "2".
|-
|0:28
|So, these are both integer numbers with no decimal point.
|-
|0:33
|Okay, now, say I want to add "num1" and "num2" together.
|-
|0:38
|So I echo out the answer of "num1" added to "num2".
|-
|0:44
|Let's test it out.
|-
|0:50
|So, that's "12". 10 and 2, num1 and num2, when 10 and 2 are added, the answer is "12".
|-
|0:54
|Okay now let's try minus. We will just replace the minus symbol there.
|-
|1:01
|Refresh and that will be "8".
|-
|1:04
|Now lets try multiplication. 10 times 2 is 20 and we've got "20".
|-
|1:10
|Next, 10 divided by 2 is just half of 10 which is "5".
|-
|1:16
|Now, what we can do is we can add something on the end of this.
|-
|1:23
|So, let's say this is divided by num2.
|-
|1:27
|Now, what I think this operation will do is, it will add "num1" and "num2", so that is add 10 and 2 which will give us 12 and then 12 divided by 2.
|-
|1:39
|So, 12 divided by 2 should give 6.
|-
|1:42
|But what this actually does is it takes num2 and divides it by num2 which will give 1 and add num1 to that.
|-
|1:55
|So, that means, instead of 6 we will get 11.
|-
|2:00
|Now, the reason for this is that division operator will always work before addition operator. The same with multiply
|-
|2:09
|Now, to solve this, we should put brackets.
|-
|2:14
|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.
|-
|2:27
|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.
|-
|2:38
|Let's refresh that and we can see that it worked!
|-
|2:43
|So, these are the basic arithmetic operators which are simple to use.
|-
|2:47
|If you come across any problems, always verify your calculations with a calculator to make sure they're working.
|-
|2:55
|We'll see a few more of these soon.
|-
|2:57
|We'll learn about the increment arithmetic operator which increments by 1 but I'll use that a little later.
|-
|3:05
|So, practice these and make sure you learn them well.
|-
|3:09
|Thanks for watching. This is Arvind dubbing for the Spoken Tutorial project.

PHP-and-MySQL/C2/Arithmatic-Operators/English - Revision history

Chandrika: Created page with '{|Border=1 !Time !Narration |- |0:00 |Welcome to this tutorial on basic arithmetic operators. |- |0:03 |I'll first go through plus, minus, multiply and divide operations. |- |0:0…'