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 Decrement and increment operators
 =================================
 
    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.
 

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(m4.info.gz) Arithmetic

(m4.info.gz) Arithmetic

(m4.info.gz) Eval