Difference between revisions of "Is Numeric"

From MidrangeWiki
Jump to: navigation, search
(Summary)
(Summary)
Line 2: Line 2:
 
== Summary ==
 
== Summary ==
 
The following are the RPG/LE fully free-form definitions and instructions needed for using the {{AN}} service procedure.  This service procedure simply allows the caller to validate that a character string is all numeric digits, decimal, and/or sign characters—or not.
 
The following are the RPG/LE fully free-form definitions and instructions needed for using the {{AN}} service procedure.  This service procedure simply allows the caller to validate that a character string is all numeric digits, decimal, and/or sign characters—or not.
 +
{| class="wikitable"
 +
|+Rule of Thumb
 +
|-
 +
|Sometimes, having a service procedure is simply a means of making code more self-documenting (i.e., easier for others to understand).
 +
|}
  
 
== Service Procedure ==
 
== Service Procedure ==

Revision as of 17:45, 13 December 2018

Summary

The following are the RPG/LE fully free-form definitions and instructions needed for using the Is Numeric service procedure. This service procedure simply allows the caller to validate that a character string is all numeric digits, decimal, and/or sign characters—or not.

Rule of Thumb
Sometimes, having a service procedure is simply a means of making code more self-documenting (i.e., easier for others to understand).

Service Procedure

**free

//==============================================================================
// Validates variable-length character string for numerics only.
//   Returns a Boolean true/false value as a result.
//==============================================================================
dcl-pr GenUtl_isNumeric ind;
  pString               varchar(50) const;
end-pr;

//==============================================================================
// Validates variable-length character string for numerics only.
//   Returns a Boolean true/false value as a result.
//==============================================================================
dcl-proc GenUtl_isNumeric export;
  dcl-pi *n             ind;
    pString             varchar(50) const;
  end-pi;

  dcl-c GenUtl_Numeric  '0123456789.+-';

  if %len(pString) = *zero;            // if no supplied value
    return *off;                       // indicate not numeric
  endif;

  return (%check(GenUtl_Numeric: pString) = *zero); // return result of check
end-proc;