Answer External suboroutines are used to tasks that more than one program is likely to want perfomed. To use an external subroutine, the programmer needs to know where to find it, whats its name is, how to send data to it, and how the answer will come back.Once this technicalities are deal with, however, the programmer can make use of the code to perform a task, with confidence that the subroutine will provide the correct result.
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