problem with IF

[will97]

i'm not an expert (some of you will thought that i am stupide but...)

i need help with the IF thing

can somebody here can tell me how to use it

(i tryed a lot of thing and they all dont work)

Code: Select all

if ()
{
   
}

[Fuzzy]

an example..

if (something is tested)
{
do something here if the test is true
}

is how it works. now as for what to fill in..

if (Jumping==1)
{
Here is code to make him fall
}

see the double ==? that means compare. if you only use one = then it means assign.

so...

x = 100;

means make x contain the value 100

x == 100

means compare the value of x to the value 100

if you use a single = in an if sign, it assigns that value, and the if statement acts true, causing the instuctions within the {} brackets to be executed. Its a common error.

What if you wanted to see if something is not true? use this

if (jumping != 1)
{
allow character to jump code
}

! means not, so != means not-equal

if (x > 100)

means check to see if x is greater than 100.

if (x < 100) means check to see if it is less than 100.

if (x <= 100) is greater than or equal.. and the opposite is >=

you may also combine two tests in one if...
if ((x > 100) && (Jumping == 1))

&& means 'and'

|| means 'or', so if either test passes, do the code.

you may also occasionally use

if ((test == 1) ! (jumping == 1))

which means if the first, but NOT the second is true, execute the code.

You may also see

if (test)
{

}

which presumes that the variable is true, or positive.

and...
if (!test)

which means its not true..


hope this helps. if you have a defective If statement, post it here, and we will examine it for errors.

[sonicfire]

and dont forget the else statement:

Code: Select all

this = 0; (this is false)


if (this)
{
    // do something
} else {   // since "this" is 0
    // do something else
}

you can also add more if-else-statements if you like:

Code: Select all

this = 0; (this is false)
that = 1; (that is true)

if (this)
{
    // do something
} else {   // since "this" is 0
    if (that == 1) // or just write "if (that)" (if that is true)
    {
         // do that
     }
}

[Game A Gogo]

and also the else if command, it is use when you want to check something like this:

Code: Select all

if(var==1)
{
//do something
}
if(var==2)
{
//do something else
}
if(var==3)
{
//do something
}
if(var>=4)
{
//do something
}

You could turn the code like this:

Code: Select all

if(var==1)
{
//do something
}
else if(var==2)
{
//do something else
}
else if(var==3)
{
//do something
}
else if(var>=4)
{
//do something
}

that could augment a little the frame rate when the action is executated, this is useful in the draw actor.
but remember, you still can do this:

Code: Select all

if(var==1)
{
//do something
}
else if(var==2)
{
//do something else
}
if(var2!=1 && var==3)
{
//do something
}
else if(var2>var)
{
//do something else
}

And if you just have ONE line of code, you still can do this

Code: Select all

if(var<=10)//put the action here

instead of

Code: Select all

if(var<=10)
{
//action here
}

hope this helps also!

[will97]

I try this and it work

Code: Select all

if (somthing)
the action

[Game A Gogo]

it because there isn't a line break at the end of the IF statement i think.