Help !.
Whats the maths expression you can use to flip a variable between 0 and 1 everytime you call it ?
I've forgotten.
Whats the maths expression you can use to flip a variable between 0 and 1 everytime you call it ?
I've forgotten.
Maths Expression
Blitz3D Forums/Blitz3D Beginners Area/Maths Expression x = 1 - x
or
x = Not x
In general, to flip between values a and b use the sum s
s = a + b
Now to flip x
x = s - x ; if x was one of a or b it is now the other.
or
x = Not x
In general, to flip between values a and b use the sum s
s = a + b
Now to flip x
x = s - x ; if x was one of a or b it is now the other.
Thats the one, thanks Floyd
Just out of interest, I wonder which one would compile to the faster instruction ??
Just out of interest, I wonder which one would compile to the faster instruction ??
or
x=x Xor 1
x=x Xor 1
Another useful value flipping trick is:-
x = -x
to flip the positive/negative sign of x.
Not what you were after but it might come in handy for you sometime.
x = -x
to flip the positive/negative sign of x.
Not what you were after but it might come in handy for you sometime.