-= doesn't work

[DavidW]

OK, this one surprised me. var1 -= var2 is supposed to abbreviate var1=var1 - var2. Unless I am seriously confused, it doesn't do anything.

e.g.

Code: [Select]

OUTER_SET x=10
OUTER_SET x-=2
PRINT "%x%"
Should be 8, actually is 10.

[Argent77]

It looks like whitespace is important. This code works as expected:

Code: [Select]

OUTER_SET x = 10
OUTER_SET x -= 2
PRINT "%x%"  // output: 8

Without whitespace around the operator, WeiDU treats "x-" as the variable name that has been assigned the value 2.

Code: [Select]

OUTER_SET x-=2
PRINT "%x-%"  // output: 2


[Wisp]

It comes down to ambiguous grammar. Quote the variable name and the code works, or include whitespace, because then the ambiguity is gone.
 

[DavidW]

Ah. OK, that makes sense. Just a special case of - being a pain. Sorry for false alarm.