92 lines
6.4 KiB
HTML
92 lines
6.4 KiB
HTML
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<title>Expressions in CL commands</title>
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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">Expressions in CL commands</h1>
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<div><p>A character string expression can be used for any parameter, element,
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or qualifier defined with EXPR(*YES) in the command definition object.</p>
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<div class="section"><p>Any expression can be used as a single parameter in the <span class="cmdname">Change
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Variable (CHGVAR)</span> and <span class="cmdname">If (IF)</span> commands.
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An expression in its simple form is a single constant, a variable, or a built-in
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function. An expression usually contains two operands and an operator that
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indicates how the expression is to be evaluated. Two or more expressions can
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be combined to make a complex expression.</p>
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<p>The following types of expressions
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are supported in CL programs:</p>
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<ul><li> Arithmetic <samp class="codeph">(&VAR + 15)</samp> </li>
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<li> Character string <samp class="codeph">(SIX || TEEN)</samp> </li>
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<li> Relational <samp class="codeph">(&VAR > 15)</samp></li>
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<li> Logical <samp class="codeph">(&VAR & &TEST)</samp></li>
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</ul>
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<p>A <em>complex</em> expression contains multiple operands, operators
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that indicate what operation is performed on the operands, and parentheses
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to group them. Only one operator is allowed between operands, except for the
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+ and - signs when they immediately precede a decimal value (as a signed value),
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and the *NOT operator when it is used in a logical expression.No complex expression
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can have more than five nested levels of parentheses, including the outermost
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(required) level.</p>
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<p>Arithmetic and character string expressions can be
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used together in a complex expression if they are used with relational and
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logical operators; for example: <samp class="codeph">(A=B&(1+2)=3)</samp>. A pair
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of arithmetic expressions or a pair of character string expressions can be
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compared within a relational expression. Also, relational expressions can
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be used within a logical expression</p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbam6arithexp.htm">Arithmetic expressions</a></strong><br />
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The operands in an arithmetic expression must be decimal constants or decimal or integer CL variables.</li>
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<li class="ulchildlink"><strong><a href="rbam6charstrngexp.htm">Character string expressions</a></strong><br />
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The operands in a character string expression must be quoted or unquoted character strings, character variables, or the substring (%SUBSTRING or %SST) built-in function.</li>
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<li class="ulchildlink"><strong><a href="rbam6relatexp.htm">Relational expressions</a></strong><br />
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The operands in a relational expression can be arithmetic or character string expressions; they can also be logical constants and logical variables.</li>
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<li class="ulchildlink"><strong><a href="rbam6logicexp.htm">Logical expressions</a></strong><br />
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The operands in a logical expression consist of relational expressions, logical variables, or constants, separated by logical operators.</li>
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<li class="ulchildlink"><strong><a href="rbam6opsinexp.htm">Operators in expressions</a></strong><br />
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Operators are used in expressions to indicate an action to be performed on the operands in the expression or the relationship between the operands.</li>
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<li class="ulchildlink"><strong><a href="rbam6operpriority.htm">Priority of operators when evaluating expressions</a></strong><br />
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When multiple operators occur in an expression, the expression is evaluated in a specific order depending upon the operators in the expression.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbam6clprograms.htm" title="This covers elements of CL such as character sets and values, expressions, built-in functions, and naming within commands.">Control language elements</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rbam6express.htm" title="An expression is the value used as the result of evaluating an expression.">Expressions</a></div>
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