incr(n) - phpMan

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 vari-
       able must be an integer.  If increment is supplied then its value (which must be an  inte-
       ger) 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)

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