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It's OK as you can see here now this checkbox is checked.



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So as you can see first I actually created a boolean variable called Am I healthy.



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And then I assigned the value false to my variable OK.



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So now as you can see here I assigned the value falls to my body.



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And then I created an if statement here and inside the apprentice's of this statement I specified that



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if the value of this.



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Am I healthy valuable OK it is true then execute this line of code here inside of these inside of these



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curly braces.



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And then as you can see I created another Else statement here else.



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If the value of this.



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Am I healthy valuable is not true.



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Then execute this line of code inside of these curly braces.



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So as you can see here.



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Now as you can see this checkbox is checked so it is.



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So it has actually executed this line of code here.



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OK I see it as healthy no.



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So this object is 6 x helping No Dot said check it.



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True as you can see it is now checked OK.



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So hopefully that makes sense.



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And now let's actually comment out these lines of code here because I want to actually show you another



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important point about Boolean expressions.



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Now let's actually create an integer variable so int and the name of this variable is for example power.



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And then I assign a value to this variable for example number 70.



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And now I can actually assign another value to this.



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Am I healthy valuable.



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So am I healthy.



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Assignment operator.



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So let's actually put in a pair of hand brackets here.



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So as you know this this variable is actually a boolean variable.



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So we need to actually assign a value true or false to this variable.



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So I can just create a boolean expression and then assign the result of that set of that expression



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to this variable.



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So inside Apprentice's again just typing power is greater than 70.



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OK.



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So as you can see here I actually referred to the name of these boolean valuable and then I assigned



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this expression to display in variable.



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Ok power is greater than 70.



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So if the value of this expression evaluates to true that true value is going to be assigned to this



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and my help we worry about it.



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But if this expression evaluates to false that's false value is going to be assigned to this.



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Am I healthy valuable.



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OK so if the value of this power variable.



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Ok as you can see this is our power value is greater than 70.



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OK then as you can see the value of this expression evaluates to true and then that true value is going



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to be assigned to this and my healthy body.



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But if the value of these are power variable is not greater than 70 as you can see here the value of



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this expression evaluates to false and that false value is going to be assigned to this.



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Am I help valuable.



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So now as you can see the value of this power variable is 70.



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And here I am specifying that if the value of this power variable is greater than 70 then this expression



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evaluates to true.



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But as you can see this value is not greater than 70.



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This value is equal to cival 270.



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OK so this expression evaluates to false and that's false value is going to be assigned to this am I



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have a healthy body but.



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So let's actually create another statement here.



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If I'm healthy.



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So here I am specifying that if the value of this a healthy variable is true OK then execute this line



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of code inside of these curly braces so I can just type in C x.



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Hello yes.



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That said checked through OK and here as you can see I specified that if the value of this am a healthy



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variable is true then execute this line of code here inside of these curly braces.



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So as you can see I've just referred to the name of this variable.



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Ok so by just referring to the name of this boolean variable I am specifying that if the value of that



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variable is true or not.



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OK so I just refer to the name of this variable.



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I am I am saying that if the value is true then execute this line of code.



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Else if that value is not true.



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So I need to put in an exclamation mark before this variable name.



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LS If the value of this variable is not true then execute this line of code inside of these curly braces



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C as x Helfen No that said check it.



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True.



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OK so now let's actually run our project see what happens.



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So as you can see here now our application is actually running on this emulator here.



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OK.



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And as you can see this checkbox is actually checked there's no checkbox.



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OK.



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First I actually referred to the name of this am I healthy.



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Boolean variable.



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And then I assigned this expression for this variable and then I actually create it.



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And if else statement here if the value of this and I help with variable is true then execute this line



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of code.



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Or check this checkbox or else if the value of this boolean value is not true.



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Executes this line of code and check these checkboxes.



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OK.



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So hopefully that makes sense.



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OK so now let's actually go back inside this main activity that java file here.



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And let's actually comment out these lines of code here because I want to actually show you another



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important point about Boolean expressions.



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OK.



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So first let's actually fell to the name of this Am I healthy boolean valuable assignment operator put



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in a pair of round brackets here.



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So here I can just typing.



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And here in say The Apprentice's I can just put in a boolean expression here so I can just type in power



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is greater than 70 questionmark OK true Colin Firth's.



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OK so as you can see here first of all I actually felt that the name of this Am I healthy boolean value



97

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but OK.



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And then I put an assignment operator here and here I actually created a boolean expression and the



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result of this boolean expression is going to be assigned to this and we help evaluate it.



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So what does this boolean expression do.



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You can see here.



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First of all I actually referred to the to the name of this power integer variable.



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OK.



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So and that puts a greater than sign here.



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And then I put number 17 here.



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OK.



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So if the value of this power variable is greater than 70 as you can see question mark if this value



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is greater than 70.



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Question mark.



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True.



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So this means if the value of this power integer valuable is greater than 70 or the value that is going



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to be assigned to this and I help variable is true.



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Otherwise this colon means otherwise ok otherwise.



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And this means if the value of this power variable is not greater than 70 the false value is going to



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be assigned to this.



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Am I healthy valuable.



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OK so let me explain again.



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First I actually referred to the name of this.



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I help you out here.



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OK.



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And then I put an assignment operator here and then I actually put in a pair of round brackets and then



122

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I actually created a boolean expression inside these prentices.



123

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So here I actually referred to the name of this integer variable power greater than 970.



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If the value of this power in digerati is greater than 70.



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Question mark if this value is greater than 70 the value that is going to be assigned to this happy



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variable is true.



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Otherwise this value is going to be false.



128

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OK if the value of this power integer valuable is not greater than 70 the value falls is going to be



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assigned to this help with value valuable.



130

00:08:27,670 --> 00:08:31,030

So now let's actually create an if statement.



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If Am I healthy.



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And then I need to actually open and close my statement by using these curly braces.



133

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H x held for years that said check it.



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00:08:42,480 --> 00:08:43,290

True.



135

00:08:43,990 --> 00:08:44,620

OK.



136

00:08:44,740 --> 00:08:51,730

And here I am specifying that if the value of this am I help with value but is true then execute this



137

00:08:51,730 --> 00:08:55,470

line of code here and then check this checkbox here.



138

00:08:55,510 --> 00:08:56,710

OK take this up.



139

00:08:56,710 --> 00:08:57,850

Yes checkbox.



140

00:08:58,180 --> 00:09:06,760

But if the value of these power integer value is not greater than 70 this false value is going to be



141

00:09:06,760 --> 00:09:13,270

assigned to this and we help you value it I can't just create an L statement or I can just create an



142

00:09:13,690 --> 00:09:14,760

if statement.



143

00:09:14,970 --> 00:09:15,720

OK.



144

00:09:16,030 --> 00:09:21,630

And then I can say Apprentice's I can't just type in else if not Am I healthy.



145

00:09:22,120 --> 00:09:26,730

And this means the value of this highly variable is false.



146

00:09:27,010 --> 00:09:30,190

OK so c h x.



147

00:09:30,250 --> 00:09:33,550

Helfen note that said checked ok for us.



148

00:09:33,640 --> 00:09:37,250

So now let's actually run our project and see what happens.



149

00:09:37,300 --> 00:09:41,210

And then inside Apprentice's I can I need to actually put into value 2.



150

00:09:41,380 --> 00:09:41,910

OK.



151

00:09:42,070 --> 00:09:47,290

And this means as if the value of this am I help evaluate but is not true.



152

00:09:47,590 --> 00:09:48,780

So it is false.



153

00:09:48,850 --> 00:09:51,880

Then check that C X healthy no checkbox.



154

00:09:52,030 --> 00:09:56,290

OK so now let's actually run our project and see what happens.



155

00:09:56,290 --> 00:10:00,640

So as you can see here now with this checkbox is actually checked.



156

00:10:00,790 --> 00:10:01,340

OK.



157

00:10:01,480 --> 00:10:09,130

So if I actually change the value of this power variable for example to number 97 and if I run my project



158

00:10:09,130 --> 00:10:10,870

again let's see what happens.