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REM Advent of Code 2022: Day 10, both parts
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REM Written in Applesoft BASIC
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10 GR
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20 CX = 0
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22 CY = 14
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24 AD = 0
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26 X = 1
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28 CC = 1
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38 ST = 0
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40 D = 0
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42 SC = 1
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44 SM = 20
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50 PRINT CHR$ (4),"OPEN INPUT"
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60 PRINT CHR$ (4),"READ INPUT"
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70 ONERR GOTO 1000
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REM Read the next input line into S$.
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100 S$ = ""
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110 GET C$
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120 IF C$ < " " GOTO 200
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130 S$ = S$ + C$
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140 GOTO 110
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REM Parse into instruction letter ("a" or "n") and addx parameter N.
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200 L = LEN (S$)
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205 IF L = 0 GOTO 1000
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208 PRINT "> ";S$
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210 II$ = LEFT$ (S$,1)
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220 IF L < 6 THEN N = 0
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230 IF L > 5 THEN N = VAL ( RIGHT$ (S$,L - 5))
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240 D = 0
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250 AD = 0
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REM Update the "CRT" based on X-position and X-register.
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300 COLOR= 0
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310 IF ABS (X - CX) < 2 THEN COLOR= CX / 5 + 1
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320 PLOT CX,CY
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330 CX = CX + 1
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340 IF CX > 39 THEN CX = 0:CY = CY + 1
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REM Run the next cycle. AD != 0 on 2nd cycle of addx.
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400 CC = CC + 1
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410 IF AD = 0 GOTO 450
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420 X = X + AD
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430 AD = 0
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440 D = 1
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445 GOTO 500
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450 IF II$ = "a" THEN AD = N
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460 IF II$ = "n" THEN D = 1
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REM Update strength counter, and strength total if necessary.
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REM Otherwise, GOTO 100 for next instruction or 300 for next addx cycle.
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500 SC = SC + 1
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510 IF SC < SM GOTO 530
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515 SM = SM + 40
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520 ST = ST + CC * X
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530 IF D = 1 GOTO 100
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550 GOTO 300
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REM End of input: print strength and exit.
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1000 PRINT "STRENGTH: ";ST
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1010 PRINT CHR$ (4),"CLOSE"
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1020 END
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