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How to Swap Two Variables Using Temp Variable in Python – GATE, Interview & Placement Practice
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Jun 1, 2025
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0:00
uh hello guys welcome to this video so
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in this video I will show you a very
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common problem which is asked inside
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coding placements and competitive exams
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such as GATE which is how to swap two
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numbers using a third temporary variable
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so this is really easy program so if you
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want this is actually the Python program
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that I written so if I execute this
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program it will ask you to enter two
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values enter the value of a so let's
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suppose I write 15 then we write the
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enter the value of B so if I write 25 so
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as I execute this program both the
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values will be swapped uh 25 will become
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15 and 15 be will come 25 so as you can
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see now the value of a after swapping is
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25 and b is 15 so we are simply
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exchanging both the variables value
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using the third variable so we how we do
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this it's very simple logic let me show
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you this
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program inside this software which is
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Python
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tutor which will show you step by step
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how the code executes so first of all we
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take the input here we take both the
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values so if I write 15 and then I
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write 10 for B so as you can see both
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the variables have been assigned here
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are stored as global variables a is 15 B
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is 10 now we come to the logic so we
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declare here this third variable it is
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it can be called as anything so I'm just
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calling it as temp so temporary variable
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so inside this we store the value of
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whatever it's stored inside a which is
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15 here so we store it inside your new
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variable which is
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temp so we store it 15 so after we
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execute this you will see it will create
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a new variable temp which is storing 15
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right
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here so we create a third variable after
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that whatever is the value present
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inside B which is 10 we are replacing it
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in the A variable so we are swapping it
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simply equaling A is equal to B so
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whatever is present in B is transferring
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it in A so now after we execute this you
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will see A value will change to 10 and
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now whatever is present in your
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temporary variable we just need to
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transfer this to B so very simple logic
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as you can see using the third variable
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it becomes very easy to swap two numbers
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so if I execute now B value will be 15
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so you can see both the numbers have
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been
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swapped and using this third temporary
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variable so now we can print out the
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value of A after swapping is 10
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similarly the value of B after swapping
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is 15 so it's a very simple program in
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which we do how to swap two numbers
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without using the third variable which
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is
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temp so this is the program here it is
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commonly asked inside interviews
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whenever you go for programming
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interviews competitive exams as well and
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like it so this is actually the logic
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so please hit that like button subscribe
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the channel and also check out my
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website freemediatetools.com
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uh which contains thousands of tools
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