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Hey, guys, what's up?



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So today we are going to learn one more concept called global variable.



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So what are global labor?



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So until now, we have only started local variables.



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So what are local variables?



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So when I ride in demesne and and I ride an X, so X is a local variable because its scope is only this.



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I cannot access X here.



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For example, see out X and you give me at it.



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So local variables are those who are bounded by scope, whose existence is bounded by the scope.



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For example, if you create any variable in a loop also then also for example.



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And anyway.



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So this is local variable because it's the scope is limited.



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Now there was a study global variable.



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So the scope of global variable is basically its its core base from the starting of the program to the



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end of the program.



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OK, so it can be accessed anywhere.



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For example.



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So how to declare that this is a global variable, so I will write in X and then I will write into Mean.



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OK, so now here X is a global variable, X is a global variable.



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Why?



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Because it is not bounded by any curly brackets.



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OK.



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So it will exist everywhere.



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And suppose you want to, let's say the value of access to all the global variable and the value of



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global variable is done.



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Now I am writing and X is close to 10.



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So will this give me either.



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No.



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Why?



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Because this X and this X, they are different.



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Why?



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Because their scope are different.



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X is a local variable.



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Whereas this is a global variable.



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So if I write C out X so virtual printer then tension with printer or to will be printed.



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So answer is 10 will be my output.



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So for accessing global variable, I will write see out scope resolution operator and then X.



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So this is called Scope Resolution



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Operator.



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Now if you will print this, then your output will be equal.



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OK, so you have to tell the compiler that this I am trying to access a global variable, otherwise



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there may be conflict like this.



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OK.



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So if you write normally it will be a local variable.



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And if you want to access the global variable, we will use scope resolution.



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Operator.



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OK.



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You can also change the way of global variable, like X equals X plus two.



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OK.



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You can also change the value of global variable.



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So let's see.



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So let's name this as global Nazi BP, so global



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Nazi BP.



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Now we will right where they were.



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We asked China to allow.



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So first of all, make a global variable, so and X equals 10, let's say 20.



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So X is a global variable here.



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Now let us create one local variable.



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So and X equals 10.



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OK, so this X is a local variable.



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And this X is a global variable.



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So this is global mediæval.



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And this is my local variable.



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OK.



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Now, if you were to right, she yelled X.



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So what should be my output?



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Let's see.



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So I'm out for this coming out to.



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Then why?



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Because local variable value is getting printer.



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Now, if you want to access global variable, we're doing rate scope resolution operator.



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Now let's test.



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So now it is.



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Doing OK, so this is global variable.



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Now, what if I remove this X now that does not allow.



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So global variable is getting printed.



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OK.



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So what if I do?



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What if I remove this scope resolution operator?



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So what will happen?



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So there are two possible things that can happen.



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So first will be rendered.



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Second, the come by level.



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Show us error at this lane.



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So let's see what will happen.



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So Tony is getting printed.



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So I told you that if we want to access a global variable, we will write school resolution operator



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before the name of the very well.



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But here I have not written the school resolution operator.



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So why it is working.



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Because compilation starts from top and it will go towards boredom.



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So when my compiler will reach line number 10, it already know that there is a variable that is existing



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at line number four.



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So it will not show us at it.



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OK.



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So when compiler will reach nine number 10, it knows that there is a variable called X, which is present



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already.



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So it will not give us error.



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Hence my output will be full.



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So this is hours work.



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So compiler is smart enough.



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OK.



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Now when I was having 10 here.



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So to differentiate between this local variable and this a global variable, then I used the scope resolution



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operator propelled the compiler.



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Do not get confused between this and the guess I want.



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This means I want a global.



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Don't show me the value of local.



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OK.



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You can also change.



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You can also change the value of X, for example.



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Let there does make X equals 20.



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So now 20 will be my outward.



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OK, so today's getting printer and hair access a global variable.



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So next, we knew we were loo.



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When exercise to get a better understanding of global and local variables.



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OK, so that is it for this video.



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Thank you.