Answer / Nilesh Rai

In RPG400, both 'ITER' and 'DO' are looping constructs but they differ in their functioning. 'ITR' is used for sequential access to records within a file while 'DO' is used for repetitive operations without specific data structures or files.nn`ITER` uses a pointer to move from one record to the next, whereas `DO` executes a block of code repeatedly a specified number of times.

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