$Alpha: Difference between revisions

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<p>
<p>
The <var>$Alpha</var> function verifies whether a string is composed only of characters which are valid in the specified (or default) language.  
The <var>$Alpha</var> function verifies whether a string is composed only of characters that are valid in the specified (or default) language.  
</p>
 
==Syntax==
<p class="syntax"><span class="term">%result</span> = $Alpha(<span class="term">string</span> [,<span class="term">language</span>]) </p>
 
<table>
<tr><th>%result</th>
<td>A numeric variable that contains:
<ul>
<ul>
<li>1 is returned for a true condition.</li>
<li>1, for a true condition.</li>
<li>0 is returned for a false condition if:
<li>0, for a false condition if one of these occurs:
<ul>
<ul>
<li>the string contains digits, spaces, or punctuation marks, or</li>
<li><var class="term">string</var> contains digits, spaces, or punctuation marks</li>
<li>the string is null, or</li>
<li><var class="term">string</var> is null</li>
<li>U.S. English characters in the string have accent marks.</li>
<li>U.S. English characters in the string have accent marks</li>
</ul>
</ul></li>
</li>
</ul></td></tr>
</ul></p>


==Syntax==
<tr><th>string</th>
<p>The format of the $Alpha function is:</p>
<td>The string to be verified. <var class="term">string</var> must be one of the following:
<p class="syntax">$Alpha(<span class="term">string</span> [,<span class="term">language</span>]) </p>
<p>
Where:</p>
<ul>
<li><var class="term">string</var> represents the string to be verified. The string must be one of the following:
<ul>
<ul>
<li>A literal enclosed in quotation marks</li>
<li>A literal enclosed in quotation marks</li>
<li>A %variable</li>
<li>A [[Using variables and values in_computation|%variable]]</li>
<li>A field name without quotation marks. In this case, the function call must be embedded in a <var>FOR EACH RECORD</var> loop where the current value of the field is verified.</li>
<li>A field name without quotation marks. In this case, the function call must be embedded in a <var>[[Record_loops#FOR_EACH_RECORD_statement|FOR EACH RECORD]]</var> loop where the current value of the field is verified.</li>
</ul></li>
</ul></td></tr>


<li>The optional <var class="term">language</var> argument specifies the language to use. The language argument is handled as follows:
<tr><th>language</th>
<td>An optional string that specifies the language to use. <var class="term">language</var> is handled as follows:
<ul>
<ul>
<li>You can enter a literal enclosed in quotation marks or a %variable containing a valid language name. If the value you enter is not a supported language, the request is canceled with the following error message. See the <var>[[LANGUSER parameter|LANGUSER]]</var> parameter for the valid values.
<li>You can enter a literal enclosed in quotation marks or a %variable containing a valid language name. If the value you enter is not a supported language, the request is canceled with the following error message. See the <var>[[LANGUSER parameter|LANGUSER]]</var> parameter for the valid values.
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<li>If you omit the <var class="term">language</var> argument, <var class="product">Model&nbsp;204</var> performs the validation in U.S. English, even if the value of the <var>LANGUSER</var> parameter is not <code>US</code>, and lowercase characters are not recognized.</li>
<li>If you omit the <var class="term">language</var> argument, <var class="product">Model&nbsp;204</var> performs the validation in U.S. English, even if the value of the <var>LANGUSER</var> parameter is not <code>US</code>, and lowercase characters are not recognized.</li>


<li>An asterisk enclosed in quotation marks (<tt>'*'</tt>) instructs <var class="product">Model&nbsp;204</var> to use the value of the <var>LANGUSER</var> parameter.  
<li>An asterisk enclosed in quotation marks (<tt>'*'</tt>) instructs <var class="product">Model&nbsp;204</var> to use the value of the <var>LANGUSER</var> parameter. </li>
</li>
</ul></td></tr>
</ul></li>
</table>
</ul>


==Examples==
==Examples==

Latest revision as of 20:04, 8 January 2018

The $Alpha function verifies whether a string is composed only of characters that are valid in the specified (or default) language.

Syntax

%result = $Alpha(string [,language])

%result A numeric variable that contains:
  • 1, for a true condition.
  • 0, for a false condition if one of these occurs:
    • string contains digits, spaces, or punctuation marks
    • string is null
    • U.S. English characters in the string have accent marks
string The string to be verified. string must be one of the following:
  • A literal enclosed in quotation marks
  • A %variable
  • A field name without quotation marks. In this case, the function call must be embedded in a FOR EACH RECORD loop where the current value of the field is verified.
language An optional string that specifies the language to use. language is handled as follows:
  • You can enter a literal enclosed in quotation marks or a %variable containing a valid language name. If the value you enter is not a supported language, the request is canceled with the following error message. See the LANGUSER parameter for the valid values.

    M204.2340: INVALID LANGUAGE ARGUMENT: 'language' FOR $FUNCTION: ALPHA

  • If you omit the language argument, Model 204 performs the validation in U.S. English, even if the value of the LANGUSER parameter is not US, and lowercase characters are not recognized.
  • An asterisk enclosed in quotation marks ('*') instructs Model 204 to use the value of the LANGUSER parameter.

Examples

The following table has examples of the string and language arguments as literals.

Function code... Returns...

$alpha('JOHN','US')

1

$alpha('MÂCON','FRENCHC')

1

$alpha('MÂCON','US')

0

$alpha('JOHN SMITH','US')

0

$alpha('ÎLE D'ORLÉANS','FRENCHC')

0

$alpha('12A','US')

0

$alpha('12A','FRENCHC')

0

In the following code example, the request sorts and prints the names of agents whose name contains nonalphabetic characters. The quoted asterisk in the $Alpha call causes Model 204 to verify the contents of the field AGENT against whatever language is indicated by the value of the LANGUSER parameter:

RESET LANGUSER 'FRENCHC' BEGIN POL.HOLDERS: FIND ALL RECORDS FOR WHICH RECTYPE = POLICYHOLDER END FIND FOR EACH RECORD IN POL.HOLDERS IF NOT $alpha (AGENT, '*') THEN PLACE RECORD ON LIST BADNAME END IF END FOR ORDERED.LIST: SORT RECORDS ON LIST BADNAME BY AGENT FOR EACH RECORD IN ORDERED.LIST PRINT AGENT END FOR END

Note: For upward compatibility reasons, $Alpha and $Alphnum do not recognize lowercase English letters as alphabetic characters unless a non-null language parameter is specified.