IBM SC34-5764-01 Manual do Utilizador descarregar pdf (Página 171)

100

101

NOP

Purpose

 NOP ; 

NOP is a dummy instruction that has no effect. It can be useful as the target of a THEN or ELSE clause:

Example:

Select

when a=c then nop /* Do nothing */

when a>c then say 'A > C'

otherwise say 'A < C'

end

Note: Putting an extra semicolon instead of the NOP would merely insert a null clause, which would be

ignored. The second WHEN clause would be seen as the first instruction expected after the THEN,

and would, therefore, be treated as a syntax error. NOP is a true instruction, however, and is,

therefore, a valid target for the THEN clause.

NOP

Chapter 13. Keyword Instructions 149

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