NAME¶
incr - Increment the value of a variable
SYNOPSIS¶
incr varName ?
increment?
DESCRIPTION¶
Increments the value stored in the variable whose name is
varName. The
value of the variable must be an integer. If
increment is supplied then
its value (which must be an integer) is added to the value of variable
varName; otherwise 1 is added to
varName. The new value is
stored as a decimal string in variable
varName and also returned as
result.
EXAMPLES¶
Add one to the contents of the variable
x:
Add 42 to the contents of the variable
x:
Add the contents of the variable
y to the contents of the variable
x:
Add nothing at all to the variable
x (often useful for checking whether
an argument to a procedure is actually numeric and generating an error if it
is not):
SEE ALSO¶
expr(3tcl)
KEYWORDS¶
add, increment, variable, value