Flip

Flip — Change value to zero if it is one and vice versa.

Flip TargetVariable

Return Value

1	If input was zero.
0	If input was one.

Arguments

TargetVariable

What to flip. Can be either a value or @VarName (will upvar and read/write).

More Info

Note that the variable must already have a zero or one to begin with.

Note that arguments of the form XxxVariable can take either a normal value or the name of a variable to read/write, prefixed by @. See About Using @ for details.

For information regarding exceptions / errors, see here.

% Flip 0
1
% Flip 1
0

% set MyVar 0
0
% Flip @MyVar
1
% puts $MyVar
1