Write a C++ program that incorporates three functions subtraction, addition and operation. The
subtraction and addition accepts two integer parameters and are used to return the added and subtracted
values respectively. The operation function accepts two integer parameters and a pointer to a function
and which is used to call the pointed function that returns the computed value accordingly, and which is
then returned to the main function to be displayed. The main function declares two pointers sum and
minus to the functions addition and subtraction respectively and then calls the operation function twice,
each with respective arguments.
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