Read comma separated numbers
We know how to read one number. Let's do something more complex : read multiple numbers, with comma separator.
Process is rather simple:
- Read a char
- It's a digit : part of the current number
- It's a comma : start a new number
Let's start
- Memory: empty
- Cursor: first cell
- Input: A, B, C, ... (comma separated integer values)
Process
- Leave first cell empy (array delimiter)
- Start a number (leave another empty cell)
- While a char is read
- Subtract 44 ("," ASCII code) and set an else flag
- Result is not null
- Subtract again 4 (44+4 = 48, and -48 converts a digit char into a digit value)
- Update current integer (add it nine times to the actual digit, then this whole block to the current integer)
- Reset else flag
- Result is not null
- Start a number (leave another empty cell)
- Loop
Code
>> Leave first cell empy (array delimiter); Start a number (leave another empty cell)
,[ While a char is read
>++++++[-<------->]+<-- Subtract 44 (comma ASCII code) and set an else flag
[---- Result is not null : subtract again 4
>->+++++++++[-<<< Update current integer
[->+>+<<]>>[-<<+>>] (add it nine times to the actual digit
>]<<[-<+>] then this whole block to the current integer)
]>[ Result is null
-> Move to start a new number
]<
,] Read an loop
#Minified version
>>,[>++++++[-<------->]+<--[---->->+++++++++[-<<<[->+>+<<]>>[-<<+>>]>]<<[-<+>]]>[->]<,]
Final state
- Memory: 0, numbers, 0
- Cursor: on final 0
- Input: empty
- Output: unchanged
Test program
This program reads comma-separated integer values, and then print the corresponding ASCII chars
>>,[>++++++[-<------->]+<--[---->->++++++++ read comma separated values
+[-<<<[->+>+<<]>>[-<<+>>]>]<<[-<+>]]>[->]<,] ** part 2 **
<[<]>[.>] Go back to the first value, and print them all as chars
Try with 66,114,97,105,110,70,117,99,107,32,114,111,99,107,115,32,33,33,33 for example :)
