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<title>20.9.3 Invoking procedures </title>
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<a name="1204964"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">20.9.3 Invoking procedures</font>
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<a name="1204966"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A procedure is invoked by the name of the procedure followed by its actual arguments, as follows:</font>
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<a name="1204967"> </a><font size=2 face=Courier><strong><font size=2 face=Courier><strong><em>name actualArgument1 actualArgument2</em></strong></font> ...<br></strong></font>
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<a name="1204968"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Procedures may be invoked recursively.</font>
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<a name="1204969"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Using such calls, a built-in command, such as <font size=2 face=Courier><strong>break</strong></font>, can be used in a command language program where a procedure would be used.</font>
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<a name="1204970"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Each actual parameter to a procedure is a string. If a string with spaces or tabs is to be passed to a procedure then the string must be enclosed by double quotes (<font size=2 face=Courier><strong>"</strong></font>). If a string is to be evaluated before being passed to a procedure then that string should be bracketed. For example, the value of the variable <font size=2 face=Courier><strong>k</strong></font> may be passed to a procedure called <font size=2 face=Courier><strong>enter</strong></font> as follows:</font>
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<a name="1204971"> </a><font size=2 face=Courier><strong>enter (k)<br></strong></font>
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<a name="1204972"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">If, however, the string "<font size=2 face=Courier><strong>k</strong></font>" is to be passed to <font size=2 face=Courier><strong>enter</strong></font> then the command should be:</font>
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<a name="1208748"> </a><font size=2 face=Courier><strong>enter k<br></strong></font>
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<a name="1208749"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">If the string "<font size=2 face=Courier><strong>"(k)"</strong></font>" is to be passed to <font size=2 face=Courier><strong>enter</strong></font> then the command should be:</font>
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<a name="1208750"> </a><font size=2 face=Courier><strong>enter "(k)"<br></strong></font>
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<a name="1204978"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Argument semantics are the same for invoking both procedures and commands.</font>
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