Commodore 128 - SECTION 4 Advanced Basic Programming

SECTION 4
Advanced Basic Programming
COMPUTER DECISIONS—The IF-THEN Statement ............. 4-3
Using the Colon .......................................................................... 4-4
LOOPS—The FOR-NEXT Command ........................................ 4-5
Empty Loops- Inserting Delays in a Program ........................ 4-6
The STEP Command .................................................................4-6
INPUTTING DATA.........................................................................4-7
The INPUT Command...............................................................4-7
Assigning a value to a variable ............................................. 4-7
Prompt messages .................................................................. 4-8
The GET Command .................................................................. 4-9
Sample Program...................................................................... 4-10
The READ-DATA Command ................................................. 4-11
The RESTORE Command ..................................................... 4-12
Using Arrays............................................................................ 4-13
Subscripted Variables......................................................... 4-13
Dimensioning Arrays .......................................................... 4-14
Sample Program .................................................................. 4-15
PROGRAMMING SUBROUTINES .......................................... 4-17
The GOSUB-RETURN Commands....................................... 4-17
The ON GOTO/GOSUB Commands.................................... 4-17
USING MEMORY LOCATION .................................................. 4-18
Using PEEK and POKE for RAM Access ............................. 4-18
Using PEEK........................................................................... 4-19
Using POKE......................................................................... 4-19
4-1