How to make an "and" function? variables?

Unity Engine
1

So I just got into unity when I stumbled upon this problem.

I followed Brackeys code tutorial on player movement when I realized that the player can jump as much as they want.

So I tried to make a isgrounded boolean but I can never find the correct way to implement it into my codes.

I want to make a code if (Input.GetButtonDown(“Jump”)) && isgrounded = true;
{
jump = true
isgrounded = false
}

But every time I use the &&, it said that it’s not possible or something along those lines. I know that it’s the basic fundamental to know about this but I can’t seem to figure it out.

Any help would be appreciated and sorry for my lack of English vocabulary, I am still learning so excuse me if I make any mistakes.

4822511–462497–PlayerMovement.cs (910 Bytes)

2

Note this is misunderstanding the C# language and not misunderstanding Unity.

Three problems:

  • The expression should all be within the brackets so “if (SomeExpression)”

  • = is used to assign a value not compare equality. You should use “==”

  • ; (semi colon) at the end of that line isn’t supposed to be there.

So you should end up with:

        if (Input.GetButtonDown("Jump") && isgrounded == true)
        {
            jump = true;
            isgrounded = false;
        }

It’s also a minor thing but you can implicitly check if something is true/not null by doing this subtle but sometimes easy-on-the-eyes code:

        if (Input.GetButtonDown("Jump") && isgrounded)
        {
            jump = true;
            isgrounded = false;
        }
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3

When you use Code Tag it would be easier to see your code.

You first IF statement linę is incorrect.
You need put first condition && and second condition in same brackets. For example

if ( conditionA >= 0 && isConditionBTrue )
{
  // some code
}

Edit:
Sorry I writing from mobile.

1 Like
4

Ty for the help, I really appreciate this!

5

You’re welcome.

1 Like
6

So I need both conditions in a same bracket like this

if (Input.GetButtonDown(“Jump”) && isgrounded = false; )

Or am I missing the point here?
Sorry for this but I don’t get the point your are telling me…

Can you explain it a little more details?

7

I gave you an example of the correct code above, simply look at the difference if you don’t follow my explanation. If I explain in more detail it seems it’ll make things more confusing for you.

1 Like
8

Melv explained you best way.
You need this

if (Input.GetButtonDown("Jump") && isGrounded == true)

or its simplified form

if (Input.GetButtonDown("Jump") && isGrounded )

meaning
isGrounded is same as isGrounded == true.
Also, in comparison loops, you don’t use normally single equal sign.

This is wrong.
use double equal sign for comparison

isgrounded == false

Singe equal sign is for assignment, like a = 2.
Also, you don’t put semicolon inside if loops. This is wrong ( see ; character after false ).

Corrected with if statement is as following

if (Input.GetButtonDown("Jump") && isgrounded == false )
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