What is the difference between iter and do? We know both are used to execute set of statements repeatedly, but what is the main difference?


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during input operation which indicator position is seton if there is a record lock?

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What is a message file?

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I/o error detected,Record Out of sequence,Permanent I/o error occured....I mean give one eg for these errors...i understand only,update/delete operation without prior read oprn..give details of remaining

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