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Labels
Labels are the basis of all flow-control in an assembly-language
program. They associate an offset in the code segment with a symbol
which can be referred to in jump instructions. There are no
high-level control structures in assembly such as while loops or for
loops; instead everything must be done through unconditional jumps,
tests, and conditional jumps. The argument of a jump instruction is
usually given as a label (although masochists and users of the
ROM-resident mini-assembler in the Apple ][ give these as hexadecimal
numbers).
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