Is This A Bug In The iOS ZX81 Emulator?
Posted: Tue May 23, 2023 2:28 am
Or am I doing something stupid? I can’t for the life of me work out why the second output of this routine is zero. It should be 1.
Line 150 should return “1”. If you input the results of part one manually (C=6, X=4, A=2) and run the program from line 120, it produces the correct result: line 150 returns “1”. If you print out C, X and A between line 80 and 120, they are 6,4 and 2. If you print A and C after line 130 they are 2 and 2, as they should be. If you print out A and C after line 140 they are 2 and 2. So why on earth is F zero?
Some numbers it works properly. For example if you change the starting conditions to C=24, X=4 and A=9, it works correctly. But starting with C=6, X=2 and A=3 gives the wrong output at 150 too.
Why is this? What am I missing?
Code: Select all
10 Let C=24
20 Let X=4
30 Let A=8
40 Let C= C/X
50 Let D= A/C
60 Let F= Int D
70 Let A= (D-F)*C
80 Print F
120 Let C= C/(x-1)
130 Let D=A/C
140 Let F= Int D
150 Print F
Some numbers it works properly. For example if you change the starting conditions to C=24, X=4 and A=9, it works correctly. But starting with C=6, X=2 and A=3 gives the wrong output at 150 too.
Why is this? What am I missing?
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