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If you are thinking of manually loading the array at program
initialization, then also remember this.

If you decide to load the array from the file - and you believe that now
or in the future, you will not be loading ALL the records from the file
- then load the array from the end of the file.
That is end of the file in RRN reverse sequencial order.
Then you are more likely to avoid the inactive no-longer-used records
found at the beginning of the file.
In fact, when you interogate the file, you often find that the first
records in the file were history records from some conversion effort.
And may not be in use anymore.
This is usually true of customer and order files. Note that files of
master codes are usually not like this, and that the codes still in use
are scattered throughout the file.

. . . define the array with a max of 100k elements . . .


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