Apple-2-SW
/
bitmap-editor
mirror of https://github.com/tilleul/apple2.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Update 04_avoid_integer_variables.md

This commit is contained in:
tilleul 2022-08-08 09:37:28 +02:00 committed by GitHub
parent 27e7f95481
commit 4b4c72cb37
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
applesoft/nfs/general/04_avoid_integer_variables.md
View File

@ -12,7 +12,7 @@ Where we learn that Applesoft's integers won't make you whole.
- [Recommendations](#-recommendations)
## 🍎 How integer variables are handled
Applesoft integer variables are variables whose name end with a "%" character. They can hold integer values from -32767 to 32767. That's almost the range of signed integer numbers on 2 bytes, but because of a bug in Applesoft you can't have -32768 ($8000) in an integer variable.
Applesoft integer variables are variables whose name ends with a "%" character. They can hold integer values from -32767 to 32767. That's almost the range of signed integer numbers on 2 bytes, but because of a bug in Applesoft you can't have -32768 ($8000) in an integer variable.
Integer variables are stored in memory in the same area as the other "simple" variables (floats, strings and ```DEF FN``` variables), by default right after the end of the program. If integer variables' values are limited to two bytes, they are in fact stored on five bytes, the last three being unused. These 3 unused bytes are reset to zero when the variable is created but subsequent assignments won't touch them.