148 lines
7.5 KiB
HTML
148 lines
7.5 KiB
HTML
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<head><title>GOSUB Examples</title>
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<h1>GOSUB Examples</h1>
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<div class="ImagePlusCaption">
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<div class="Col2">
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<p>
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<img src="../../graphics/pgm_icon1.gif" border="0" alt="BS1 icon" title="BS1 icon" />
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<img src="../../graphics/pgm_icon2.gif" border="0" alt="BS2 icon" title="BS2 icon" />
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<img src="../../graphics/pgm_icon2e.gif" border="0" alt="BS2e icon" title="BS2e icon" />
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<img src="../../graphics/pgm_icon2sx.gif" border="0" alt="BS2sx icon" title="BS2sx icon" />
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<img src="../../graphics/pgm_icon2p.gif" border="0" alt="BS2p icon" title="BS2p icon" />
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<img src="../../graphics/pgm_icon2pe.gif" border="0" alt="BS2pe icon" title="BS2pe icon" />
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<img src="../../graphics/pgm_icon2px.gif" border="0" alt="BS2px icon" title="BS2px icon" />
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</p>
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</div>
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<p style="text-align: right;">Syntax: <a href="../Commands/GOSUB.htm" target="" title="" alt="" class="MCXref_0" xrefformat="{paratext}">GOSUB</a></p>
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<p> </p>
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</div>
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<p class="clear"> </p>
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<p class="PlainText"> </p><pre class="BScode" xml:space="preserve">' GOSUB.BS1
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' This program is a guessing game that generates a random number in a
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' subroutine called Pick_A_Number. It is written to stop after three
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' guesses. To see a common bug associated with GOSUB, delete or comment
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' out the line beginning with END after the FOR-NEXT loop. This means
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' that after the loop is finished, the program will wander into the
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' Pick_A_Number subroutine. When the RETURN at the end executes, the
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' program will go back to the beginning of the program. This will cause
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' the program to execute endlessly. Make sure that your programs can't
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' accidentally execute subroutines!
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' {$STAMP BS1}
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' {$PBASIC 1.0}
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SYMBOL rounds = B2 ' number of reps
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SYMBOL numGen = W0 ' random number holder
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SYMBOL myNum = B3 ' random number, 1-10
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Setup:
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numGen = 11500 ' initialize random "seed"
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Main:
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FOR rounds = 1 TO 10
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DEBUG CLS, "Pick a number from 1 to 10", CR
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GOSUB Pick_A_Number
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PAUSE 2000 ' dramatic pause
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DEBUG "My number was: ", #myNum ' show the number
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PAUSE 1000 ' another pause.
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NEXT
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DEBUG CLS, "Done"
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END ' end program
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' Random-number subroutine. A subroutine is just a piece of code with
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' the RETURN instruction at the end. Always make sure your program enters
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' subroutines with a GOSUB. If you don't, the RETURN won't have the
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' correct address, and your program will have a bug!
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Pick_A_Number:
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RANDOM numGen ' stir up the bits of NumGen.
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DEBUG numGen, CR
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myNum = numGen / 6550 MIN 1 ' scale to fit 1-10 range.
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RETURN ' go back to 1st instruction
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</pre>
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<p class="PlainText"> <![CDATA[ ]]></p>
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<p>NOTE: The example below is written for the BS2 and will run on any of the BS2-family modules. Modify the $STAMP directive (as required) before downloading to the BS2e, BS2sx, BS2p, BS2pe, or BS2px.</p><pre class="BScode" xml:space="preserve">' GOSUB.BS2
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' This program is a guessing game that generates a random number in a
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' subroutine called Pick_A_Number. It is written to stop after three
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' guesses. To see a common bug associated with GOSUB, delete or comment
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' out the line beginning with END after the FOR-NEXT loop. This means
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' that after the loop is finished, the program will wander into the
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' Pick_A_Number subroutine. When the RETURN at the end executes, the
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' program will go back to the beginning of the program. This will cause
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' the program to execute endlessly. Make sure that your programs can't
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' accidentally execute subroutines!
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' {$STAMP BS2}
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' {$PBASIC 2.5}
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rounds VAR Byte ' number of reps
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numGen VAR Word ' random number holder
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myNum VAR Byte ' random number, 1-10
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Setup:
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numGen = 11500 ' initialize random "seed"
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Main:
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FOR rounds = 1 TO 10
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DEBUG CLS, "Pick a number from 1 to 10", CR
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GOSUB Pick_A_Number
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PAUSE 2000 ' dramatic pause
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DEBUG "My number was: ", DEC myNum ' show the number
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PAUSE 1000 ' another pause.
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NEXT
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DEBUG CLS, "Done"
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END ' end program
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' Random-number subroutine. A subroutine is just a piece of code with
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' the RETURN instruction at the end. Always make sure your program enters
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' subroutines with a GOSUB. If you don't, the RETURN won't have the
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' correct address, and your program will have a bug!
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Pick_A_Number:
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RANDOM numGen ' stir up the bits of NumGen.
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DEBUG DEC ? numGen
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myNum = numGen / 6550 MIN 1 ' scale to fit 1-10 range.
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RETURN ' go back to 1st instruction
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' after GOSUB that got us here
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</pre>
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<p MadCap:conditions="BSEconditions.BSEWebHelp (Primary)-INCLUDE"><a href="../../HomeTopics/HomePage.htm">Go to Welcome page</a>
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<p style="text-align: right;"><span class="ContactInfoProjectName">BASIC Stamp Help</span> <![CDATA[ ]]><span class="ContactInfoVersion#">Version 2.5.4</span> <![CDATA[ ]]></p>
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<p style="text-align: right;">Copyright © <span class="ContactInfoCompanyName">Parallax Inc.</span></p>
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<p style="text-align: right;"><span class="SystemShortDate">8/8/2012</span>
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