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111 lines
4.6 KiB
Markdown
111 lines
4.6 KiB
Markdown
[Home](https://qb64.com) • [News](../../news.md) • [GitHub](https://github.com/QB64Official/qb64) • [Wiki](wiki.md) • [Samples](../../samples.md) • [InForm](../../inform.md) • [GX](../../gx.md) • [QBjs](../../qbjs.md) • [Community](../../community.md) • [More...](../../more.md)
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## SAMPLE: MADNESS
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### Author
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[🐝 Dennis Mull](../dennis-mull.md)
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### Description
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```text
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*****************************************************************************
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MADNESS.BAS
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by Dennis Mull and Tina Sweet
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Copyright (C) 1994 DOS World
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Published in Issue #22, July 199, page 53
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MADNESS.BAS will test your genius for solving puzzles. It's easy to play,
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but hard to win.
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Play centers on a board consisting of a row of ten squares. Each of the four
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squares at the left end of the board contains a red playing piece; each of
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the four squares on the right end contains a blue piece. To win, you must
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move the red pieces to the right end of the board and the blue pieces to the
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left end. But you can move a piece only by jumping over another piece or by
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advancing it one or two blank spaces at time. You can't move backward. Think
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you can figure it out? Have a try!
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To run the program from the DOS command line, change to the directory
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containing MADNESS.BAS, then type:
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QBASIC /RUN MADNESS
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Watch carefully; you might learn something, because the program begins by
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providing a demonstration of one way to win the game.
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After the demo ends, MADNESS.BAS resets the game board. Messages above the
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playing grid tell you the number of moves and the number of attempts in the
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current round of play. Below the grid are numbers identifying each square and
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prompts asking you to type the number of the piece you want to move and its
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new location. A highlighted bar at the bottom of the screen tells you to
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press the Q key to quit or the N key to start the game over.
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Now comes the challenge: figuring out a sequence of jumps and advances that
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swap the positions of the red and blue pieces. Don't even think about trying
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to move a playing piece backward. If you do, the program sounds a buzzer,
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displays a "Sorry, you may not jump backward" message, and adds two extra
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moves to your score.
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The good news is that if you meet success in four or fewer games, the program
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awards you genius status. If not, no harm done, and play continues until you
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decide to quit.
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Points of Interest
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------------------
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Pay attention to some special features of this program: the subroutines
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KEYKILL, MAKESOUND, and WARNING, plus the lines in the main program
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associated with them. You may find these routines useful in your own
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programs.
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KEYKILL keeps unwanted keystrokes from being executed while the program is
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handling other tasks. To achieve this, it clears the keyboard buffer before
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another input statement is executed.
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MAKESOUND provides control over the game's sound effects. It's a versatile
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routine. because you can add new sounds to it merely by changing the value of
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the variable WHICH% and adding a CASE and a SOUND statement to the
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subroutine. When a particular case condition is met, the program plays the
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sound immediately after that case command. To play the sound, use a line such
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as this one:
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IF AA% = 0 OR BB% = 0 THEN MAKESOUND 2: GOTO REDO
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If the value of AA% or BB% is zero, the program executes the MAKESOUND
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subroutine with the value of WHICH% set to 2. As a result, the CASE 2 sound--
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sound 50, 5 --plays.
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The structure of WARNING is comparable to that of MAKESOUND. This time,
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however, instead of triggering different sounds, various values sent to
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WARNING trigger different messages.
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As with MAKESOUND, you may add elements by appending CASE statements and
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their corresponding messages. Here, for instance, the value sent to WARNING
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is 4:
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IF A$ <> "" THEN
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IF BOX$(AA%) = "BLANK" THEN WARNING 4: A$ = ""
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END IF
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When the second line executes, the message corresponding to CASE 4 is
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displayed: "Sorry, you may not move an empty square."
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```
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### QBjs
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> Please note that QBjs is still in early development and support for these examples is extremely experimental (meaning will most likely not work). With that out of the way, give it a try!
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* [LOAD "madness.bas"](https://qbjs.org/index.html?src=https://qb64.com/samples/madness/src/madness.bas)
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* [RUN "madness.bas"](https://qbjs.org/index.html?mode=auto&src=https://qb64.com/samples/madness/src/madness.bas)
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* [PLAY "madness.bas"](https://qbjs.org/index.html?mode=play&src=https://qb64.com/samples/madness/src/madness.bas)
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### File(s)
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* [madness.bas](src/madness.bas)
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🔗 [game](../game.md), [dos world](../dos-world.md)
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