Category:Commodore BASIC: Difference between revisions
Clarified how sound and graphics were programmed in Commodore 64 BASIC V2.
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(Clarified how sound and graphics were programmed in Commodore 64 BASIC V2.) |
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Programs were tokenized into [[wp:bytecode|bytecode]], although many characters were left intact to facilitate printing the source code back out in original form; it's one of the few BASICs of the time that preserved whitespace (though not leading whitespace). Unlike some contemporary BASICs, it supported arrays of strings, and arrays could have thousands of elements as long as there was sufficient memory for them (but strings were limited to 255 bytes).
The most well-known version is 2.0, which came with the [[wp:Commodore VIC-20|VIC-20]] and [[wp:Commodore 64|Commodore 64]]. Despite the impressive sound and graphics capabilities of the machines, the language had no
In addition to the sound and graphic statements, the later versions also introduced structured programming constructs: <code>DO...LOOP</code>, which supported both pre- and post-evaluated conditions (<code>DO WHILE/UNTIL ... LOOP</code> and <code>DO ... LOOP WHILE/UNTIL</code>) as well as unconditional loop exit (<code>EXIT</code>) and <code>BEGIN...BEND</code> code blocks, which allowed multi-line conditional clauses. However, other limitations remained: variables were still all global and limited to 2-letter names, user-defined functions were restricted to a single expression with a single argument, etc.
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