Legacy GM Value subtraction?

[MintyPretzel126]

So I have this code here:

///Take Away Lives
lives - 1

How do I properly subtract the value? Thanks a bunch, even if you just read.

 

[Kijjum]

lives = lives-1;

 

[FrostyCat]

Short form:

lives -= 1;

Long form:

lives = lives - 1;

If you want to actually change the variable's value, use -=. If you don't but still want to know what the result would have been, use -.

 

[MintyPretzel126]

lives = lives-1;

Thanks for the quick reply! I'm having a little trouble with the lives starting at the wrong value right now, so I'll reply once I get that fixed.

 

[Aura]

http://docs.yoyogames.com/source/da...gml language overview/401_04_expressions.html

 

[Kijjum]

Thanks for the quick reply! I'm having a little trouble with the lives starting at the wrong value right now, so I'll reply once I get that fixed.

In the creation code of your character put lives = (number of lives you begin with);
then you can call to that variable in other actions like a collision with a bullet or something lives = lives - 1;

 

[TheouAegis]

Shorterhand:

lives--;

or

--lives;

Although it can make code less legible for some people if they aren't used to it. And the two are sliiiiiightly different in that they can both be used in-line and will read and write to lives at the same time even in the middle of code, but the value used will be the previous value if -- is put at the end, or the next value if -- is put at the beginning.

E.g.:

lives = 4;
cat = lives--;
dog = --lives;

cat will be 4, while dog will be 2. cat is set to lives before it is decreased, then lives will be decreased (from 4 to 3); dog is set to lives after it has been decreased again (from 3 to 2).

 

[Carolusclen]

Shorterhand:

lives--;

or

--lives;

Although it can make code less legible for some people if they aren't used to it. And the two are sliiiiiightly different in that they can both be used in-line and will read and write to lives at the same time even in the middle of code, but the value used will be the previous value if -- is put at the end, or the next value if -- is put at the beginning.

E.g.:

lives = 4;
cat = lives--;
dog = --lives;

cat will be 4, while dog will be 2. cat is set to lives before it is decreased, then lives will be decreased (from 4 to 3); dog is set to lives after it has been decreased again (from 3 to 2).

doesn't matter how long a person uses GM, you learn something new every day... i was not aware of this haha