Assembly languages lets programmers use symbolic addresses, which the symbolic constants.
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It has rather basic features : symbolic addresses may be defined, but symbols are only two letters long.
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The normal use of symbolic addresses is to name " paragraphs ", i . e ., related blocks of code or data.
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The symbolic addresses would be modified by a " line number " ( a numeric offset ) and a " page number " ( a number in the range 0 to 31 ).
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Programmers also used these NOP instructions to provide space for future inserted instructions, since the assembler did not allow for use of symbolic addresses, and the insertion of a single instruction could otherwise require rewriting a lot of code.
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Since three-address code is used as an intermediate language within compilers, the operands will most likely not be concrete memory addresses or processor registers, but rather symbolic addresses that will be translated into actual addresses during register allocation.
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