How to Interpret Custom long -1[C_CHARS]

Comments

• JonnyMac Posts: 8,929

  2021-02-19 20:05 edited 2021-02-19 20:13

  That is the equivalent of defining eight discrete longs with the value of -1 in the DAT block -- it's creating a DAT array with all values initialized to -1. You can address each long individully using Custom[idx] where idx is 0 to 7. If you need the address of the array you can get it with @Custom. If you later need 10 longs, you only have to change the definition of C_CHARS.
• DiverBob Posts: 1,097

  2021-02-19 20:25

  @JonnyMac said:
  That is the equivalent of defining eight discrete longs with the value of -1 in the DAT block -- it's creating a DAT array with all values initialized to -1. You can address each long individully using Custom[idx] where idx is 0 to 7. If you need the address of the array you can get it with @Custom. If you later need 10 longs, you only have to change the definition of C_CHARS.

  I have been looking for an explanation for DAT entries like 0[xxx] in the documentation. This was just perfect for adding another knowledge item, especially knowing this sets an array up with a default value. I got excited when I read this! Thank you again Jon!
• Bob Drury Posts: 236

  2021-02-19 20:29

  Thanks Jon
  Regards
  Bob Drury
• JonnyMac Posts: 8,929

  2021-02-19 22:21

  Glad to help guys. It's easy to miss, but the concept of repeated values in a DAT block is in the P1 manual.

  
• DiverBob Posts: 1,097

  2021-02-20 00:09

  Thanks for pointing that out, didn’t even think about looking in the P1 manual for that.