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Comment by max99x | Hacker News Reader

You might be hitting the fact that QBasic actually requires keywords to be in capitals. The original IDE did the conversion for you, but repl.it doesn't. We should really be more lenient about those. For now, check the existing examples and use your trusty caps lock.

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The actual QuickBASIC compiler allowed any case for keywords.

The lack of line numbers was a bit confusing too - my first inclination when seeing a BASIC prompt is to type

  10 PRINT "hello"
  20 GOTO 10

Aside from that, it seems to work as expected (at least in the quick tests I tried).

Numeric labels also don't work:

  10: PRINT "hello"
  GOTO 10

This works though:

  label: PRINT "hello"
  GOTO label

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