Numbers and Operators |Section 1| Celestial Warrior
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Hi again, in this lecture I'll show you
how to do math operations with numbers.
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So we're going to look at math operators.
Let's go straight away and open a Python
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section and let me write a math
expression there. 20 minus 10 divided by
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5 times 3 in the power of 2 and what we
get is 2.0. So why did I write this a
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long expression? Well because I want to
explain to you the order of operators so
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when you have multiple operators in an
expression the one to be executed
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first is the exponent, so we have 3 in
power of 2 here that will give us 9.
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So power is the first to be executed and
also that is division and multiplication.
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Actually division and
multiplication are on the same level.
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We're talking about order but the one
that is first will be executed first so in
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this case division is the first one so
what will happen here is Python will
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ignore minus for now,
so it will divide 10 by 5 and it will
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give 2 then it will do 2 times 9.
So again 10 divided by 5, 2 times 9, 19.
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And then we have the rest of the operators
which could be a plus or minus so in
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this case we have minus so 20 minus 18.
We have 2.0. You'd ask why we have 2.0?
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Because 10 divided by 5 gives 2.0.
So division outputs a float in Python 3.
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If you are on Python 2, it would output
an integer. Now to make your expressions
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look better, you'd want to remove the
spaces for the power operator and also
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you do like that somehow you can read it
better,
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so 2 times 9 and then 20 minus 18 and so on.
You get the idea.
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You get 2.0 again and now if you want to
execute the minus operator first
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you'd want to put that inside brackets.
So why did we get 18? Well because 20
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minus 10 gives 10 and then 10 divided by
5 gives 2 and then 2 times 9 gives 18.
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That's the idea. And then you could also do
this, put these in brackets and what
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would happen here is you know 10 here,
15 here in the power of 2, so 15 in the
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power of 2, and then 10, so 10 divided by
15 in the power of 2. Let's see what we get.
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Yeah we got that, so let's see if I was
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Right.
15 in the power of 2 we get 225.
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And then we got 10 on the other side, so 10
divided by 225. We get that number.
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So whenever you want to change the
order of operators, you should use
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brackets and so I hope you get the idea
and please try this out, so try to do a
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few operations with numbers to get used to it.
And yeah, I'll talk to you later.
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Thanks.
-
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