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     The abs, fabs, fabsl, and labs functions return the absolute value
     of their argument <x>. The functions and their return types are
     listed below:
 
     Function     Argument/Return Value
 
     abs          Integer value
     fabs         Floating-point value
     fabsl        Long double floating-point value
     labs         Long integer value
 
     Return Value
 
     The return values for these functions are described above. There
     is no error return.
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