Update BazzBasic-AI-guide.txt

BazzBasic-AI-guide.txt

@@ -2,14 +2,14 @@
 **Name:** BazzBasic-AI-guide.txt  
 **Description:** BazzBasic BASIC interpreter language reference for AI. Use BazzBasic to write, debug, or teach code.    
 **File extensions:*** ".bas"*, *".bb"*  
-**Version:** This guide is written for BazzBasic version 1.2 and is updated 10.04.26 (ddmmyy)  
+**Version:** This guide is written for BazzBasic version 1.3 and is updated 11.04.26 (ddmmyy)  
 **URL:** This guide is stored and updated at https://huggingface.co/datasets/EkBass/BazzBasic_AI_Guide
 # END METADATA
 
 ---
 
 ## BazzBasic details
-**Version:** 1.2  
+**Version:** 1.3  
 **Author:** Kristian Virtanen (EkBass)  
 **Platform:** Windows x64  
 **License:** MIT
@@ -45,7 +45,8 @@
 
 
 ### Common AI Mistakes
-- forgetting LET  
+- forgetting LET
+- Mis-using LET/ROWCOUNT with arrays
 - using LET inside subs (wastes computing time, prefer [inits] section)
 - calling function before definition  
 - not using return value from FN  (if not other chance, use temp$ to get it)
@@ -76,6 +77,16 @@ LET score$ = 0   ' Numeric variable
 LET x$, y$, z$ = 10 ' Multiple declaration
 ' x$ & y$ has value of 0 while z$ has 10
 
+**Compound assignment operators** (variables only — **not** allowed with `#` constants):
+
+```basic
+x$ += 5     ' add
+x$ -= 3     ' subtract
+x$ *= 2     ' multiply
+x$ /= 4     ' divide
+s$ += " World"  ' string concatenation
+```
+
 ' constants
 LET TITLE# = "My Game"      ' String constant
 LET_VER# = 1.2				' Numeric constant
@@ -88,7 +99,7 @@ LET_VER# = 1.2				' Numeric constant
 
 ### Built-in Constants
 - **Boolean:** `TRUE`, `FALSE`
-- **Math:** `PI`, `HPI` (π/2 = 90°), `QPI` (π/4 = 45°), `TAU` (2π = 360°), `EULER` (e)
+- **Math:** `PI#`, `HPI#` (π/2 = 90°), `QPI#` (π/4 = 45°), `TAU#` (2π = 360°), `EULER#` (e)
 - **System:** `PRG_ROOT#` (program base directory path), `BBVER#` (interpreter version as text, e.g. `"1.1"`)
 - **Keyboard:** `KEY_ESC#`, `KEY_ENTER#`, `KEY_SPACE#`, `KEY_UP#`, `KEY_DOWN#`, `KEY_LEFT#`, `KEY_RIGHT#`, `KEY_F1#`…`KEY_F12#`, `KEY_A#`…`KEY_Z#`, `KEY_0#`…`KEY_9#`, `KEY_LSHIFT#`, `KEY_LCTRL#`, etc.
 
@@ -106,7 +117,8 @@ matrix$(0, 1) = "A2"                ' Multi-dimensional
 
 | Function/Command | Description |
 |-----------------|-------------|
-| `LEN(arr$())` | Element count (note empty parens) |
+| `LEN(arr$())` | Total element count (note empty parens) |
+| `ROWCOUNT(arr$())` | Count of first-dimension rows — use this for FOR loops over multi-dim arrays |
 | `HASKEY(arr$(key))` | 1 if exists, 0 if not |
 | `DELKEY arr$(key)` | Remove one element |
 | `DELARRAY arr$` | Remove entire array (can re-DIM after) |
@@ -224,8 +236,9 @@ FN Clamp$(5, 1, 10)                ' ✗ ERROR — return value unused
 |----------|-------------|
 | `ASC(s$)` | ASCII code of first char |
 | `CHR(n)` | Character from ASCII code |
-| `INSTR(s$, search$)` | Position (1-based), 0=not found |
-| `INSTR(start, s$, search$)` | Search from position |
+| `INSTR(s$, search$)` | Position (1-based), 0=not found; case-sensitive by default |
+| `INSTR(s$, search$, mode)` | mode: 0=case-insensitive, 1=case-sensitive |
+| `INSTR(start, s$, search$)` | Search from position (case-sensitive) |
 | `INVERT(s$)` | Reverse string |
 | `LCASE(s$)` / `UCASE(s$)` | Lower / upper case |
 | `LEFT(s$, n)` / `RIGHT(s$, n)` | First/last n chars |
@@ -271,7 +284,7 @@ FN Clamp$(5, 1, 10)                ' ✗ ERROR — return value unused
 | `SGN(n)` | Sign: -1, 0, or 1 |
 | `SQR(n)` | Square root |
 
-**Math constants:** `PI`, `HPI` (PI/2), `QPI` (PI/4), `TAU` (PI*2), `EULER`
+**Math constants:** `PI#`, `HPI#` (PI/2), `QPI#` (PI/4), `TAU#` (PI*2), `EULER#`
 
 ---
 
@@ -343,6 +356,25 @@ REMOVESHAPE RECT#                   ' Free memory (always clean up)
 
 ---
 
+### Text Rendering (SDL2_ttf.dll required)
+#### DRAWSTRING & LOADFONT
+
+```basic
+' Default font (Arial)
+DRAWSTRING "Hello!", 100, 200, RGB(255, 255, 255)
+
+' Load alternative font — becomes the new default
+LOADFONT "comic.ttf", 24
+DRAWSTRING "Hello!", 100, 200, RGB(255, 255, 255)
+
+' Reset to Arial
+LOADFONT
+```
+
+`DRAWSTRING x, y` positions the top-left of the text. Requires `SDL2_ttf.dll` in the same directory as the interpreter. Prefer this over PRINT, which makes graphic screen easily blinking.
+
+---
+
 ## Sound
 
 ```basic
@@ -464,6 +496,19 @@ Use for raycasting, sprite rotation, particle systems, any high-freq trig.
 
 ---
 
+## Command-Line Arguments
+
+```basic
+' bazzbasic.exe myprog.bas arg1 arg2
+PRINT ARGCOUNT         ' number of args (2 in this example)
+PRINT ARGS(0)          ' first arg  → "arg1"
+PRINT ARGS(1)          ' second arg → "arg2"
+```
+
+`ARGCOUNT` and `ARGS(n)` are 0-based; ARGS does not include the interpreter or script name.
+
+---
+
 ## Libraries & INCLUDE
 
 ```basic
@@ -571,7 +616,7 @@ RETURN
 
     LET px$     = SCREEN_W# / 2 ' Pivot point X — where the pendulum is attached (screen center top)
     LET py$     = 10            ' Pivot point Y — a bit down from top edge
-    LET theta$  = HPI           ' Current angle in radians (HPI = 90° = starts horizontal)
+    LET theta$  = HPI#	       ' Current angle in radians (HPI# = 90° = starts horizontal)
     LET bx$                     ' Bob X position on screen (calculated each frame)
     LET by$                     ' Bob Y position on screen (calculated each frame)