Difference between revisions of "Is Digits"
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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—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—or not. | ||
{| class="wikitable" | {| class="wikitable" | ||
| − | |+ | + | |+ style="padding-left:6px;text-align:left;"|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). | |Sometimes, having a service procedure is simply a means of making code more self-documenting (i.e., easier for others to understand). | ||
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end-proc; | end-proc; | ||
</pre> | </pre> | ||
| + | |||
| + | == Examples == | ||
| + | See the [[Format Phone Number]] service procedure. | ||
| + | |||
| + | See the [[Format Zip Code]] service procedure. | ||
Latest revision as of 17:38, 17 December 2018
Summary
The following are the RPG/LE fully free-form definitions and instructions needed for using the Is Digits service procedure. This service procedure simply allows the caller to validate that a character string is all numeric digits—or not.
| Sometimes, having a service procedure is simply a means of making code more self-documenting (i.e., easier for others to understand). |
By Dave Clark
Service Prototype
Place the following in a separate copybook for inclusion in both the caller and the service program source members.
**free //============================================================================== // Validates variable-length character string for digits only. // Returns a Boolean true/false value as a result. //============================================================================== dcl-pr GenUtl_isDigits ind; pString varchar(50) const; end-pr;
Service Procedure
Place the following in a service program source member.
**free
ctl-opt NoMain AlwNull(*UsrCtl) Debug Option(*SrcStmt:*NoDebugIo)
DatFmt(*ISO) TimFmt(*ISO);
//==============================================================================
// Validates variable-length character string for digits only.
// Returns a Boolean true/false value as a result.
//==============================================================================
dcl-proc GenUtl_isDigits export;
dcl-pi *n ind;
pString varchar(50) const;
end-pi;
dcl-c GenUtl_Digits '0123456789';
if %len(pString) = *zero; // if no supplied value
return *off; // indicate not numeric
endif;
return (%check(GenUtl_Digits: pString) = *zero); // return result of check
end-proc;
Examples
See the Format Phone Number service procedure.
See the Format Zip Code service procedure.
