157 lines
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HTML
157 lines
11 KiB
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<meta name="DC.Title" content="Parameter types" />
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<meta name="DC.subject" content="parameter, defining, type, passing, parameter value to CPP, decimal value, decimal (*DEC), logical value, logical (*LGL), character value, character (*CHAR), name, name (*NAME), path name value, path name (*PNAME), generic name, generic name (*GENERIC), century digit, parameter value to CPP (command processing program), date, date (*DATE), parameter value to CPP, time (*TIME), integer (*INTn), null (*NULL), statement label, parameter value to CPP, variable, variable name (*VARNAME)" />
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<title>Parameter types</title>
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<body id="prtyp"><a name="prtyp"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Parameter types</h1>
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<div><p>This describes parameter types, including parameter types only
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for IBM-supplied commands.</p>
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<p>The basic parameter types are (parameter TYPE value given in parentheses):
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</p>
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<ul><li>Decimal (*DEC). The parameter value is a decimal number, which is passed
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to the command processing program as a packed decimal value of the length
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specified on the LEN parameter. Values specified with more fractional digits
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than defined for the parameter are truncated.</li>
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<li>Logical (*LGL). The parameter value is a logical value, '1' or '0', which
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is passed to the command processing program as a character string of length
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1 (<samp class="codeph">F1</samp> or <samp class="codeph">F0</samp>).</li>
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<li>Character (*CHAR). The parameter value is a character string, which can
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be enclosed in apostrophes and which is passed to the command processing program
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as a character string of the length specified on the LEN parameter. The value
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is passed with its apostrophes removed, is left-justified, and is padded with
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blanks.</li>
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<li>Name (*NAME). The parameter value is a character string that represents
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a basic name. The maximum length of the name is 256 characters. The first
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character is alphabetic (A-Z), $, #, or @. The remaining characters are the
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same as the first character, but can also include the numbers 0 through 9,
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underscores (_), and periods (.). The name can also be a string of characters
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that begin and end with double quotation marks ("). The system passes the
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value to the command processing program as a character string of the length
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specified in the LEN parameter. The value is left-justified and padded with
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blanks. Normally, you use the *NAME type for object names. If you can enter
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a special value such as *LIBL or *NONE for the name parameter, you must describe
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the special value on the SPCVAL parameter. Then, if the display station user
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enters one of the allowed special values for the parameter, the system bypasses
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the rules for name verification.</li>
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<li>Simple name (*SNAME). The parameter value is a character string that
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follows the same naming rules as *NAME, except that no periods (.) are allowed.</li>
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<li>Communications name (*CNAME). The parameter value is a character string
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that follows the same naming rules as *NAME, except that no periods (.) or
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underscores (_) are allowed.</li>
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<li>Path name (*PNAME). The parameter value is a character string, which
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can be enclosed in apostrophes and which is passed to the command processing
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program as a character string of the length specified on the LEN parameter.
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The value is passed with its apostrophes removed, is left-justified, and
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is padded with blanks.</li>
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<li>Generic name (*GENERIC). The parameter value is a generic name, which
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ends with an asterisk (*). If the name does not end with an asterisk, then
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the generic name is assumed to be a complete object name. A generic name identifies
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a group of objects whose names all begin with the characters preceding the
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asterisk. For example, INV* identifies the objects whose names begin with
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INV, such as INV, INVOICE, and INVENTORY. The generic name is passed to the
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command processing program so that it can find the object names beginning
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with the characters in the generic name.</li>
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<li>Date (*DATE). The parameter value is a character string that is passed
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to the command processing program. The character string uses the format <samp class="codeph">cyymmdd</samp> (<samp class="codeph">c</samp> =
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century digit, <samp class="codeph">y</samp> = year, <samp class="codeph">m</samp> = month, <samp class="codeph">d</samp> =
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day). The system sets the century digit based on the year specified on the
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date parameter for the command. If the specified year contained 4 digits,
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the system sets the century digit to 0 for years that start with 19. The system
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sets the century digit to 1 for years that start with 20. For years that are
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specified with 2 digits, the system sets the century digit to 0 if yy equals
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a number from 40 to 99. However, if yy equals a number from 00 through 39,
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the system sets the century digit to 1. The user must enter the date on the
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date parameter of the command in the format that is specified by the date
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format (DATFMT) job attribute. The date separator (DATSEP) job attribute determines
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the optional separator character to use for entering the date. Use the Change
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Job (CHGJOB) command to change the DATFMT and DATSET job attributes . The
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program reads dates with 2–digit years to be in the range of January 1, 1940,
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to December 31, 2039. Dates with 4–digit years must be in the range of August
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24, 1928, to May 9, 2071.</li>
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<li>Time (*TIME). The parameter value is a character string. The system passes
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this string to the command processing program in the format <samp class="codeph">hhmmss</samp> (<samp class="codeph">h</samp> =
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hour, <samp class="codeph">m</samp> = minute, <samp class="codeph">s</samp> = second). The time
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separator (TIMSEP) job attribute determines the optional separator to use
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for entering the time. Use the Change Job (CHGJOB) command to change the TIMSEP
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job attribute.</li>
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<li>Hexadecimal (*HEX). The parameter value is a hexadecimal value. The
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characters specified must be 0 through F. The value is passed to the CPP
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as hexadecimal (EBCDIC) characters (2 hexadecimal digits per byte), and is
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right adjusted and padded with zeros. If the value is enclosed in apostrophes,
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an even number of digits is required.</li>
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<li>Zero elements (*ZEROELEM). The parameter value is considered to be a list
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of zero elements for which no value can be specified in the command. This
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parameter type is used to prevent a value from being entered for a parameter
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that is a list even though the command processing program (CPP) expects a
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value. For example, if two commands use the same CPP, one command could pass
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a list for a parameter, and the other command may not have any values to pass.
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The parameter for the second command would be defined with TYPE(*ZEROELEM).</li>
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<li>Integer (*INT2 or *INT4). The parameter value is an integer that is passed
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as a 2-byte or 4-byte signed binary number. You can declare binary numbers
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in a CL procedure or program as variables of TYPE(*INT). You can also use
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TYPE(*CHAR) and process them with the %BINARY built-in function.</li>
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<li>Unsigned integer (*UINT2 or *UINT4). The parameter value is an integer
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that is passed as a 2-byte or 4-byte unsigned binary number. You can declare
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binary numbers in a CL procedure or program as variables of TYPE(*UINT). You
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can also use TYPE(*CHAR) and process them with the %BINARY built-in function.</li>
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<li>Null (*NULL). The parameter value is a null pointer, which is always passed
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to the command processing program as a place holder. The only PARM keywords
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valid for this parameter type are KWD, MIN, and MAX.</li>
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<li>Command string (*CMDSTR). The parameter value is a command. You can use
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CL variables to specify parameters in the command that are specified in the
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*CMDSTR parameter. However, you cannot use them to specify the entire *CMDSTR
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parameter. For example, "SBMJOB CMD(DSPLIB LIB(&LIBVAR))" is valid in
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a CL Program or procedure, but "SBMJOB CMD(&CMDVAR)" is not.</li>
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<li>Statement label. The statement label identifies the first of a series
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of QUAL or ELEM statements that further describe the qualified name or the
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mixed list being defined by this PARM statement.</li>
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</ul>
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<p>The following parameter types are for IBM-supplied commands only. </p>
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<ul><li>Expression (*X). The parameter value is a character string, variable
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name, or numeric value. The value is passed as a numeric value if it contains
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only digits, a plus or minus sign, and/or a decimal point; otherwise, it is
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passed as a character string.</li>
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<li>Variable name (*VARNAME). The parameter value is a variable name, which
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is passed to the command processing program as a character string. The value
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is left-justified and is padded with blanks. A variable is a name that refers
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to an actual data value during processing. A variable name can be as long
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as 10 alphanumeric characters (the first of which must be alphabetic) preceded
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by an ampersand (&); for example, &PARM. If the name of your variable
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does not follow the naming convention used on i5/OS™, you must enclose the name in apostrophes.</li>
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<li>Command (*CMD). The parameter value is a command. For example, the CL
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command IF has a parameter named THEN whose value must be another command.</li>
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</ul>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="defpr.htm" title="To define a parameter, you must use the PARM statement.">Define parameters</a></div>
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</div>
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</div>
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</body>
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</html>
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