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<title id="tit" xml-lang="en-US">CBool Function</title>
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<section id="cbool">
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<bookmark_value>CBool function</bookmark_value>
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<h1 id="hd_id3150616" ><variable id="CBool_h1"><link href="text/sbasic/shared/03100100.xhp" name="CBool Function">CBool Function</link></variable></h1>
<paragraph id="par_id3145136" role="paragraph">Converts an expression or a set of expressions into a boolean. An expression is composed of strings, numbers and operators. Comparison, logical or mathematical operators are allowed inside expressions.</paragraph>
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<paragraph id="par_id3194514" role="bascode" localize="false">CBool (expression As Variant) As Boolean</paragraph>
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<paragraph role="paragraph" id="par_id681638266349216"><literal>expression</literal> can be a number or a set of combined expressions.</paragraph>
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<paragraph id="par_id3155419" role="paragraph" xml-lang="en-US">Boolean</paragraph>
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<paragraph role="paragraph" id="par_id791636986444058"><emph>expression</emph>: A logical expression, a mathematical formula, a numeric expression or a set of expressions combined with operators. During expression evaluation <link href="text/sbasic/shared/03060000.xhp" name="logical operators">logical operators</link> take preceedence over <link href="text/sbasic/shared/03110100.xhp" name="comparison operators">comparison operators</link>, which in turn take preceedence over <link href="text/sbasic/shared/03070000.xhp" name="mathematical operators">mathematical operators</link>.</paragraph>
<paragraph role="paragraph" id="par_id1001638264728895">The <literal>expression</literal> can be a number or mathematical formula. When equals to 0, <literal>False</literal> is returned, otherwise <literal>True</literal> is returned.</paragraph>
<paragraph id="par_id3149655" role="paragraph">Multiple expressions such as <input>expr1 [[{operator] expr2]..]</input> can be combined. <input>expr1</input> and <input>expr2</input> can be any string or numeric expressions that you want to evaluate. <literal>CBool</literal> combines the expressions and returns either <literal>True</literal> or <literal>False</literal>. <input>operator</input> can be a <link href="text/sbasic/shared/03070000.xhp" name="mathematical operator">mathematical operator</link>, <link href="text/sbasic/shared/03060000.xhp" name="logical operator">logical operator</link> or <link href="text/sbasic/shared/03110100.xhp" name="comparison operator">comparison operator</link>.</paragraph>
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<paragraph id="par_id3145171" role="paragraph" xml-lang="en-US">In the following examples, the <literal>CBool</literal> function evaluates a logical expression, a mathematical formula and the value that is returned by the <literal>Instr</literal> function. The function checks if the character "a" is found in the sentence that was entered by the user.</paragraph>
<bascode>
<paragraph id="par_idm1340987280" role="bascode" localize="false">Sub ExampleCBool</paragraph>
<paragraph role="bascode" id="bas_id961636989038747" xml-lang="en-US"> Print CBool( 1>2 Xor 44 ) ' computes to True</paragraph>
<paragraph role="bascode" id="bas_id991636996682074" xml-lang="en-US"> Print CBool( expression := 15 /2 -7.5 ) ' displays False as expression equals 0</paragraph>
<paragraph id="par_id3155132" role="bascode" xml-lang="en-US"> txt = InputBox("Please enter a short sentence:")</paragraph>
<paragraph id="par_id3155855" role="bascode" xml-lang="en-US"> ' Proof if the character "a" appears in the sentence.</paragraph>
<paragraph id="par_id3146984" role="bascode" xml-lang="en-US"> ' Instead of the command line</paragraph>
<paragraph id="par_id3148576" localize="false" role="bascode" xml-lang="en-US"> ' If Instr(Input, "a")<>0 Then...</paragraph>
<paragraph id="par_id3154014" role="bascode" xml-lang="en-US"> ' the CBool function is applied as follows:</paragraph>
<paragraph id="par_id3155413" localize="false" role="bascode" xml-lang="en-US"> If CBool(Instr(txt, "a")) Then</paragraph>
<paragraph id="par_id3152940" role="bascode" xml-lang="en-US"> MsgBox "The character »a« appears in the sentence you entered!"</paragraph>
<paragraph id="par_idm1340972320" role="bascode" localize="false"> EndIf</paragraph>
<paragraph id="par_idm1340971088" role="bascode" localize="false">End Sub</paragraph>
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