REM
REM --- Tiny BASIC Interpreter and Compiler Project
REM --- Mugwump Demonstration Game
REM
REM --- Released as Public Domain by Damian Gareth Walker 2019
REM --- Created: 13-Aug-2019
REM
REM --- Variables
REM C: axis diff between player guess and mugwump position
REM D: distance between player guess and mugwump position
REM G: mugwump column
REM H: mugwump row
REM M: moves taken
REM R: random number generator seed
REM X: player guess column
REM Y: player guess row
REM --- Initialise the random number generator
PRINT "Think of a number."
INPUT R
IF R<0 THEN LET R=0
IF R>4095 THEN LET R=4095
REM --- Initialise the game
GOSUB 200
LET G=R-(R/10*10)
GOSUB 200
LET H=R-(R/10*10)
LET M=0
REM --- Input player guess
10 PRINT "Where is the mugwump? Enter column then row."
INPUT X,Y
IF X>=0 THEN IF X<=9 THEN IF Y>=0 THEN IF Y<=9 THEN GOTO 20
PRINT "That location is off the grid!"
GOTO 10
REM --- Process player guess
20 LET M=M+1
PRINT "The mugwump is..."
LET D=0
LET C=G-X
GOSUB 60
LET C=H-Y
GOSUB 60
IF D=0 THEN GOTO 40
PRINT "...",D," cells away."
IF M>10 THEN GOTO 50
PRINT "You have taken ",M," turns so far."
GOTO 10
REM --- Player has won
40 PRINT "...RIGHT HERE!"
PRINT "You took ",M," turns to find it."
END
REM --- Player has lost
50 PRINT "You have taken too long over this. You lose!"
END
REM --- Helper subroutine to calculate distance from player to mugwump
REM Inputs: C - difference in rows or columns
REM D - running total distance
REM Output: D - running total distance, updated
60 IF C<0 THEN LET C=-C
LET D=D+C
RETURN
REM --- Random number generator
REM Input: R - current seed
REM Outputs: R - updated seed
200 LET R=5*R+35
LET R=R-R/4096*4096
RETURN