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Hey friends, welcome back to our Python
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exercise series for beginners. If you're
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just joining, don't worry, you can still
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follow along. So today we are making
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something fun and super useful, which is
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a simple calculator, but this time using
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smart if else logic which is built in.
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So here is the plan. We'll ask the user
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for the two numbers. Then we'll do four
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operations and then we could be
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addition, subtraction, multiplication,
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and division. But wait what if the
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second number is zero and what happens
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when we try to divide it? So there is a
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problem in you know division by zero
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actually will crash our entire program.
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So we will handle that nicely using if
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All right let's go together. So we'll
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build a simple calculator
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So step one get user input.
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enter the first number
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and then to equal to input
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as we are following the mathematical
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operations, always always
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change the type of the number the input
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that you're getting. It is a string by
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default. So we are changing it to float
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because we are working on mathematical
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And step two is to perform the
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I'm going it fast because you guys have
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already you know uh have gone through
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all these steps and these are really
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easy and simple to understand. So that's
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why I'm not using I'm not going in deep
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you know taking each step digging each
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in step. So I'm just going it like we
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have already done it before. So I'm just
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which is num 1 + num 2
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and then we are going to work on
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which could be num one minus num two
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and then we are going to do
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multiplication. ation
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So now we are going to handle the
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division error. So here is where we will
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check the division. So here is where we
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I hope now you guys can see it. I'm not
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wrong. And now let's check
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So first we will check whether the
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number is zero or not. The second number
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is zero or not. So if num two not equal
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to zero. So if that's not equal to zero
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then it means it is something other than
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So which is num one by num two.
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else. That means if the number is zero
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instead of you know if the second number
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is zero then obviously if we don't print
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anything if we don't do anything if we
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just ignore it then our program is going
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to crash. So instead of getting it crash
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what we will do is we will add some
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value to the division variable so that
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it can print it for us. So which is
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See now the division will print this
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error if the second number is zero
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instead of you know crashing the entire
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program. So this is how we can handle
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and now we are going to show the
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So let's run this one. Enter the first
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number maybe two and second number maybe
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Addition 7 subtraction minus 3
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multiplication 10 and division is four
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and what if the second number is zero so
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addition may be five the first number
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maybe five I'm sorry second number zero
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see division error cannot divide by zero
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so this is how we can do it so first we
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actually had two numbers as input so
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which is the number one and number two
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and then we store the results of
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addition, subtraction and multiplication
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directly. We didn't do anything. Even in
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the previous exercise, we followed the
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same thing and here also we did the same
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thing. But coming to the third which is
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the division. So that is really
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important. So for division we actually
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checked the whether the second number is
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not zero whether the number is zero or
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not. So if the second number is not zero
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then we did just the normal division
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which is num one by num two. What if the
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second number is zero? So then the
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program will come here and what if this
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is zero? So 0 not equal to zero is
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false. Right? So then it will generally
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jump here to the else part. And then
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here it will add division which is error
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cannot divide by zero. And now the
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program goes here. It will print
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addition, subtraction, multiplication
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and division. Coming to the division it
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will take the input from here from this
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calculations it could be either this or
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this and then according to the
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conditions according to the value of the
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second number it will decide which value
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we can assign to the division. So that
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is how it will print error cannot divide
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by zero if the number two is zero. If
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the number two is other than zero any
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other number then it will directly do
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division which is number one by num two.
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So this is what we have done. Maybe if
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we don't do it, our program might may
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crash and it just politely tells the
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user that there is something wrong here.
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So in the next exercises or in the next
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upcoming concepts, we'll make our
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program even more smarter. Until then,
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you can just keep practicing, keep
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coding, and I'll see you in the next
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one. I hope you got this program done.
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If you have any doubts, feel free to
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reach out to me through comments. And
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don't forget to like, share, and
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subscribe. And also keep following us
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for the next upcoming interesting
