FAQ: Operators - Using Operators to Make Comparisons

This community-built FAQ covers the “Using Operators to Make Comparisons” exercise from the lesson “Operators”.

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FAQs on the exercise Using Operators to Make Comparisons

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Just a question on unknown quantity

probably overthinking but in the example given it sounds like you’re telling the computer that it == .5lbs not asking it correct?
The wording choice used is throwing me.

"We could weigh the strawberries and see if the total weight equals a half "

strawberry_weight = ?
is (strawberry_weight == .5lb)? = true

1 Like
.5lb

is not recognized by the interpreter. There are no units in programming. That is something that we the programmer have to keep track of.

b === 0.5 * a    // JS comparison

will be true if b is half of a.

If i understand the code, it simply means its a built in code

But then, could there be changes to it if one has to use a different value (a different number for the weight).

Variables will vary, so we need to create arbitrary values to compare them with. If we want our variable to match a certain value, then that is what we compare it to.

I’m a little confused by the strawberry code
The way I read it if the strawberries are .5lb or greater then it’s true?
strawberry _ weight = ?
is (strawberry _ weight == .5lb)? =***>*** true
Is that what the > symbol shows =>true?
Thanks,

Welcome, @mcsullie_1.

Please post a link to the exercise page of this problem.

a > b   =>  a is greater than b

a >= b  =>  a is greater than or equal to b

Note that the = sign is last in two character sequence.

if (a >= 0.5) {
    // a weighs half a pound or greater
} else {
    // a weighs less than half a pound
}

Sorry I‘m little confused, the code is (oranges > bananas)? => false means if oranges more than bananas, it will show false. But in the directory, it said ’ If that’s false, I’ll have to add more oranges.’ I can’t figure it out…

Consider,

4 > 5 ? true : false
                ^^^
4 + 1 === 5

5 > 5 ? true : false
                ^^^
5 + 1 === 6

6 > 5 ? true : false
         ^^

Relational operators always return a boolean that reflects the assertion made in the comparison. We see that neither 4 nor 5 are greater than 5, so that comparison will yield false. 6 is greater than 5, so the comparison yields true.

3 Likes

GOT IT!!Thanks!!:grin:

1 Like

I am a bit confused about the strawberry code, which is as follows:

strawberry_weight = ?
is (strawberry_weight == .5lb)? => true

The way I interpret this is that the line of code is asking: is the strawberry weight equal to .5 lb? And then if the strawberry weight is greater than .5 lb, the answer is true. Is this correct? Perhaps I am mistaking the boolean operator (>) for an arrow.

If we are to assume the language is ES6+ (JavaScript), then,

if (strawberry_weight === 0.5) {
    // code statements
}

Notice that we do not include the unit (lb), only the numeric value?

Same would apply if the language is Python:

if strawberry_weight == 0.5:
    # code statements

>
<
==
etc.

are comparison operators. Such operations yield a boolean.

1 Like

Comparison operators are the building blocks of coding.

When playing a shooting game. Did the bullet hit the target or not.
Was there three bullets or four?
For three fall in front. For four fall at back.

The Famous Temple Run game use the same basic logic.

1 Like

@mtf :slightly_smiling_face: :slightly_smiling_face: :slightly_smiling_face: :slightly_smiling_face: :slightly_smiling_face: :slightly_smiling_face: :slightly_smiling_face: :slightly_smiling_face: :slightly_smiling_face:

hello i have the same doubt as you, can you help me out if you got it
thanks

Try just a little bit harder, and don’t be so dependent on others to give you the answer. Read what they read and apply it to the problem, then you will likely ‘get it’, just as they did.

@mtf
bananas = 5
oranges = 3

is (oranges > bananas)? => false

that ‘‘false’’ shown above are we telling it to show false if oranges > bananas, or does the computer saying the answer it’s false, if it’s saying false how can we add oranges
thanks

First off, put the computer out of your mind. It is not doing anything on its own. If it is doing anything, it is carrying out our instructions. That is the only thing a computer knows how to do.

1 Like

@mtf
that ‘‘false’’ shown above are we telling it to show false if oranges > bananas

say yes or no please
iam totally new to this so sorry for asking many doubts to you