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incr(n)                                     Tcl Built-In Commands                                    incr(n)



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NAME
       incr - Increment the value of a variable

SYNOPSIS
       incr varName ?increment?
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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.

       Starting with the Tcl 8.5 release, the variable varName passed to incr may  be  unset,  and  in  that |
       case, it will be set to the value increment or to the default increment value of 1.

EXAMPLES
       Add one to the contents of the variable x:
              incr x

       Add 42 to the contents of the variable x:
              incr x 42

       Add the contents of the variable y to the contents of the variable x:
              incr x $y

       Add nothing at all to the variable x (often useful for checking whether an argument to a procedure is
       actually integral and generating an error if it is not):
              incr x 0


SEE ALSO
       expr(n)


KEYWORDS
       add, increment, variable, value



Tcl                                                                                                  incr(n)