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Hey everyone, welcome back to another
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Python exercise and this is exercise 10
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and today we are going to learn
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something super simple but very
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important which is how to swap two
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numbers using a temporary variable. And
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trust me this is one of those basic
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concepts that can help you understand
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how memory and variables work in
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programming. And also keep this in mind
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that these this question is the most
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repetative question when it comes to
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interviews. So if you learn this one
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then maybe this can help you in you know
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cracking your interview as well
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and let's first take a quick look at the
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flowchart before jumping into the code.
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So here is what happens step by step. So
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we start by reading two numbers and
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let's call them num one and num two and
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we introduce a third variable called
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temp which is here to temporarily hold
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the value of num one. So then we assign
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the value of num two to num one. I hope
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you are getting my point. And finally we
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put the value stored in temp into num
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So it's just like that the values are
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actually swapped. So like for example
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num 1 equal to 5 and num 2 equal to 8
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and there is a temporary variable there
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is nothing in that like for example
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this five is assigned in temp
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this 8 is assigned in one and then this
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five is assigned to num two. So we are
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just swapping the numbers and we are
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just changing the numbers through
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containers so that we can swap two
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numbers. That's it. Just using a
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temporary variable to swap and then we
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are displaying the number one and number
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two after switching it. So finally we
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put that value stored in the temp and
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then into the num two. So just like that
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the values are actually swapped and
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let's move to the code now. But before
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that I want you to explain it a bit more
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clear. Like for example num 1 equal to 5
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and num 2 equal to 8. There is a
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temporary variable box and you moved
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five to temp and 8 to num one and five
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and that temp to num two. It's just that
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So let's write program or if you guys
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are really interested and if you guys
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have knowledge in this just keep this
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flowchart in front of you just pause
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this at this moment and you can start
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coding. If you still have any doubts or
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if you're a beginner you can just start
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coding with me that's fine.
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So just give num num one equal to input.
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Enter the value of num one.
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So here we are actually
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the inputs from the user.
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or you can just skip equal to or
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a temporary variable.
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So temp equal to num one
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and num one = to num two
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and then num two will be the temporary.
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So temp equal to num one and num one
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will be num two and num two will be
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temporary. So now we just have to
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So you can just print
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print. You can just you know just copy
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paste these two things.
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So this is what the swapping is all
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I hope you are getting my point. Like
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So here we are actually showing them.
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And now temp equal to num one which
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here and here the num two will be the
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num one will be the num two. So what is
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the value of num2 which is five. So five
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will be inserted here and n2 equal to
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temporary. So what is the temporary
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and what's the value of it? H right.
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So if you see here initially num 1 8 and
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num 25 but now the number one five and
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28 I want you to take a pen and paper I
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would suggest you to write and you know
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try to trace it line by line that is how
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you learn how programming exactly works
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how each line will be executed that's
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the beauty of it if you write on you
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know with pen and paper
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That's the beauty of it. You will
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understand the beauty of it. So this is
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what we are doing in order to swap two
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numbers using the third variable.
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So if you see here we are actually
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taking the input from the user and let's
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say you know five and eight.
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So before the swap we display the
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original values and then here we are
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actually swapping and then after
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swapping we are displaying the values.
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So that's pretty straightforward right?
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But even though it's simple the swapping
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method is used in so many real world
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Try this out yourself. Play with
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and see the magic happen. If you want, I
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can also explain how to swap two numbers
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without using a temporary variable. And
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trust me, that one's even more fun. So,
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just comment down below if you need that
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logic or if you need the explanation of
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that logic. So, so don't forget to hit
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like, subscribe, and comment below if
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you understood the logic or if you want
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me to explain any part again. Just let
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me know and catch you in the next one.
