you probably want to create a structure to hold the data for each customer so that the values will not disappear on each iteration of the do-loop. Then you will need an array or a linked list of those structures. After entering the account number search the array or list for the structure that contains that account number. If found then adjust the members of the structure with the values you enter in the do-loop. If the structure is not in the list, fill out a new structure and add it to the array or list.
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