Download "C Programming Tutorial - 17 - Making Decisions Using if Statements"

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alright guys welcome back to another

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tutorial and in this video we're gonna

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be making our programs a lot smarter

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than they have been because I'm gonna be

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teaching you guys how to create a

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computer program that can make a very

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simple decision now the decision that

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it's going to be making is we're gonna

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give it some code we're just gonna like

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print something out on the screen and

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our program is gonna decide whether it

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wants to run it or not and if you guys

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are like ok it's a computer program it

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does what I tell it to do so it has to

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run it right well not exactly so let me show you guys

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what I'm talking about I'll type the

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syntax in right now and show you guys

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the basic structure of it so what you do

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is you type the keyword if and right

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after that type parentheses right there

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now in between those parentheses we're

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gonna be giving it some sort of test and

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we'll just make them really simple like

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check if a number is equal to another

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number or like check if one number is

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less than another number so these tests

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can be kind of confusing but I'm just

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going to show you guys some real basic

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ones for this tutorial

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now after that put two little curly

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brackets and any code that's in between

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your brackets is going to run if that

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test is true so again we're gonna be

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putting the test right here and the code

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we'll just write something simple like

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print something out on the screen but

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this is the basic structure of how to

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allow your computer and make a decision

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so I'm gonna go ahead and show you guys

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the actual example so this makes sense

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so like I said just test something

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really easy like is the number four less

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than the number ten well of course we

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know that it is so in this case it would

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run whatever code is right here like

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print something out on the screen and

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it'll just put like a easy us so

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whenever you run this we see that it

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does indeed print out so of course what

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your computer did is it said okay you

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want me to test this okay is for less

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than ten yes it is run this so now let

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me show you guys an instance where the

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test would be false and I'll talk to you

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guys about the different types of tests

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that you can do well

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of course right now you know that you

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can do less than you can also do greater

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than so let's do that

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so this it says it's for less than ten

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this one right here this does not equal

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true for is not greater than ten so any

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code that goes right here like printout

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meatball if we try to run this we see

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that it does not print out meatball so

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even though we typed this line of code

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right here in our program check it out

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it doesn't print it out because we gave

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it a test it wasn't true and it made the

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decision not to run it pretty sweet so

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before I show you guys at an example of

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when you would actually use this in real

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life instead just print out meeple on

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the screen I'll talk to you guys about

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the different types of tests that you

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can use so of course you knew less than

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greater then there's also greater than

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or equal to and this case would be like

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if you want to test as someone who's

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like can enter a website their age would

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be like greater or equal to 18

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there's also less than or equal to in

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some other ones let me go ahead and type

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some numbers in here too and another one

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that you can do is test if two numbers

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are equal to each other now whenever you

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do this you actually use two equal signs

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you're like okay well in math class I

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just write is X equal to ten or

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something and the reason you don't use

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one equal sign in computer programming

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because remember whenever you're making

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variables in assigning values to

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variables you're at something like X is

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equal to ten and one equal sign in c

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programming means a sign of value to a

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variable two equal signs means test if

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one value is equal to another value so

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again just remember that um you'll get

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used to it after a while it's very

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simple now the only other test I want to

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talk to you guys about right now is this

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not equals two it's basically the

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opposite of equal to so in this test

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right here whenever you want to test is

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something is not equal to five it's

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going to be true in every instance

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five so this of course is basically the

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opposite of equals equals to five is

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indeed not equal to five that's true so

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we ran this bit of code so let me go

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ahead and show you guys an actual

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example when you would use this and what

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we can we can actually just code that

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one that I just talked about we can

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allow the user to enter their age and if

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they're above 18 or if they're 18 then

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we can allow them to enter some sort of

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website but you know like what website

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would the user need to be above 18 to

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enter I don't know I can't think of

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anyone but well code it anyways easy

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caps lock

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okay so int age and then we'll just go

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ahead and give them some little prompt

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on the screen printf

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enter your age actually I want to ask

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them a question how old are you uline

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and of course if we're asking them a

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question we probably should give them an

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area to write into and this is just

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gonna be a simple integer so percent D

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and of course ampersand age so now we

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have the users age which is some number

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in the variable age so now we need to

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make that basic if statement the test if

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their age is above 18 simple enough so

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if H is greater or equal to because

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their members said they can also be 18

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18 so this is gonna be true in anything

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like 18 1984 it's gonna be false and of

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course for 3 you know like a bunch of

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three-year-olds use computer but anyways

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let's go ahead and just print something

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like prim you may enter this website

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so we can go ahead and run this and

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hopefully if it works how old am I

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27 you may enter this website chello now

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another thing that we can do is we can

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also output something if they are under

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18 in that simple you can just write if

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and let me give myself a little bit of

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space to work with right here so if H is

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less than 18 what can we write just

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write wholly nothing to see here

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so run this and of course if we say

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something like how old are you 86 it

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still says you may enter this website

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and nothing else and if you run this

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again how old are you well I'm actually

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only 6 years old nothing to see here so

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pretty sweet our programs are getting a

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little bit more interactive and actually

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right now I guess this is a good time to

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talk to you guys about nesting if

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statements so actually put that in the

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next tutorial so you know I don't want

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to overlap overload your guys's brain in

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this one so in the next tutorial I'm

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gonna show you guys have nested if

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statements make decisions like right

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after another so it's gonna be awesome

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thing guys for watching I'll see you

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then

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