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(m4.info)Incr

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Decrement and increment operators
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   Increment and decrement of integers are supported using the builtins
`incr' and `decr':

     incr(NUMBER)
     decr(NUMBER)

which expand to the numerical value of NUMBER, incremented, or
decremented, respectively, by one.

     incr(4)
     =>5
     decr(7)
     =>6

   The builtin macros `incr' and `decr' are recognized only when given
arguments.