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What's Up Guys? This is bucky. welcome to your eighth  c plus plus tutorial and in this tutorial,
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i wanna talk to you guys about something called if statement. now the if statement
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is a way we can have our program make very
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basic decisions. What we are going to be doing is
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we're going to be giving our computer program a test.
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and its gonna run that test. If the test is true,
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then it is gonna run a certain bit of code. If the test is false,
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it's not going to run any bit of code. So, depending on that test, depends
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whether we run code or not.
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So it sounds confusing, but it's actually incredibly simple.
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so let me go ahead and I'll show you the syntax for an if statement right now.
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the syntax to make an if statement as 'I' 'F'.
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You just go ahead and take the word 'if' and then go ahead and add parentheses.
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now inside our parentheses is where we're going to be making our test
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now after those parentheses, go ahead and add curly braces
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now this is called the body of the if statement. and now here is where we write the 
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code
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to run if the test is true. so let's go ahead and make a simple bit of code.
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Let's go ahead and write like cout, uhm, 
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Bucky is AWESOME
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so it for test is true it's going to print out Bucky is AWESOME on the screen.
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If the test is false it's not going to print out anything. so let's go ahead
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and let me talk to guys about
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different types of tests. The first test I want to show you guys
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is the greater than test. and this simply tests if
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one value is greater than another value. so if
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5 is greater than 3, go ahead
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and run this code. so 5 is indeed greater than three.
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so this is true. so whenever we build and run this it's gonna say
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"Bucky is AWESOME. pretty cool huh? So now it's go ahead
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and make something like, uhm,  is one
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greater than 3? So, it's going to test this. is one greater in three?
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well this is actually false. one is less than three, so it's not gonna run this
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bit of code.
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so go ahead build and run this. and as you can see, it did not print out "Bucky is
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AWESOME" on the screen.
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how sad. so of course we have the greater than test
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we obviously have the less than test. 1 less
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than 3. Well, now this is going to be true so it's going to print out "Bucky is
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AWESOME" on the screen
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so, let's go ahead and run this. and indeed it prints out "Bucky
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is AWESOME". so aside from greater than
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and less than, we also have these two tests.
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greater than or equals to, so
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whenever we tested whether 3 is greater than three,
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this test is gonna be false because three is not greater than three
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three is actually equal to three. well if we want to test if
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3 is greater than or equal to 3, we use greater than
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with the equal sign after it so now whenever we run it.
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is 3 greater than or equal to 3? Yes.
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3 is equal to 3 so print it printed out "Bucky is AWESOME"
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so aside from that we also have the less than or equal to.
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so if you know is 1 less than or equal to 3
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yes one is less than or equal to 3, so it is going to print out "Bucky is awesome"
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so again what I want to show you guys is that you have
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greater than, less than, greater than or equal to,
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and less than or equals to. So now those are called the relational
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operators. we also have two more tests that we can do
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and these are called a equality operators. this
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is a really simple test. It tests whether one value is equal to
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another value or if one value is not equal to another value.
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so in order to do this go ahead and write is 3
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equal to equal to 3? and you might be thinking all right, 
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why don't I just use one equal sign? why didn't they make it that way?
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well whenever we were creating variables such as int
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X equals 8. the one equal sign the single equal sign is a sign for creating
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variables in assigning values.
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so that's why they decided that two equal signs was sufficient for testing. So, 
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remember
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uhm, a common mistake is to put one equal sign in their
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and you're going to get an error, or something terrible is going to happen. so whenever
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you're testing
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you need two equal signs. so let's go ahead and run this test.
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is three equal to three? well yes. it is, so it's going to print out
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Bucky is AWESOME. Uhm, give it another test like is seven
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equal to three? well no it's not. so it's not going to print out Bucky is AWESOME.
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so that is one test is called the "equals sign" "equals sign"
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or equal to test. And,
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there's one more test I wanna go over and thats explanation point equal sign.
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and this is the key word for not equals to. so
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is 8 not equal to or in other words is
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eight different than eight? Well no, it's the same
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so it's not going to print out everything. is
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10 different than 8? well yes, it is. So, that's going to be true
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it's gonna print out Bucky is AWESOME. So, that is all the tests that I have for you guys.
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and that's all the tests C plus plus. again to recap one last time
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greater than, less than, greater than or equal to,
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less than or equal to, equal and not equal.
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so now that we know all those tests, uhm, 
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I probably should tell you guys this, people typically don't
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and by people I mean computer programmers computer programmers typically don't
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just test two numbers against each other. They usually
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have variables that they usually test against each other. Like int a
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equals 98. int b equals 76.
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and then they test something like, is a
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uhm, greater than b? we'll go ahead and run this
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98 is indeed greater than 76, so
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of course that is true. It is going to print out Bucky is awesome. an aside from that,
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uhm, you either have two variables to test or you have a variable
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and a value, like is 98 greater than 5?
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something like that. we can actually mix variables with values.
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and that would be true as well. so again you can either have to values in here,
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two variables, or variable on one side and a value on another side.
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pretty cool, huh? so that's the basics of,
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uhm, again relational operators are the greater than and less than one,
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and the equality operators are the equals equals, and 
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explanation point equals, so now that we know
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had make a basic if statement.  again to recap on last time.
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if your test and then the body
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and its gonna run the test in a that code is true is gonna run the body
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that's the basics of "if" statement. Now that we understand that, we can begin
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enhancing our programs a little bit more. so in our next tutorial what I am going to be doing
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is I'm going to be having the user enter two numbers, 
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and we're going to be comparing those numbers and depending on what numbers
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they answered
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run a certain bit of code. So now as you can see
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we are just building and building to our knowledge a C plus plus to make better and
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better programs.
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so don't skip over if statements,  because it's a huge part a C plus plus. 
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so for now that's all I have for you guys. so thank you guys for watching. In the next tutorial, 
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we're going to be building that calculator thingy, so it's gonna be
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awesome so thank you guys for watching and don't forget to subscribe. And don't forget to check out my website