math problem

[Rocco]

i have this code

Code: ags

  index_pic = (sprite_ammount * (-currentPosition)); 

but get not the result i expected.

example
index_pic = 10 * (-7);
if i type this in my calculator i get = 3
if this code is executed in AGS i get = -30

how must this statement look like, to get the result i need?

[NsMn]

Uhmm.... I'm seriously confused. Shouldn't it be -70?

[Crimson Wizard]

Are you sure you dont type in "10 + (-7)" on your calculator?  
I don't have a clue about what may be wrong with AGS , however. Because, as NsMn said, it must be -70.

[Calin Leafshade]

i dunno if -variablename works.

you might want to try -1 * variablename

[Crimson Wizard]

i dunno if -variablename works.

It must... I think I've used that couple of times.

[CShelton]

Minus variable name does work but it gets weird with the order of operations when a multiply comes just before it.

Code: ags

variable1 * -variable2

Will totally flake out, so do this instead:

Code: ags

-variable2 * variable1

Oops, or just read Calin's reply that I somehow missed.

[Rocco]

thx, it works now.