The factorial is the product of all positive integers less than or equal to n, denoted by n!. The factorial operation is encountered in many areas of mathematics, notably in permutations, combinations, algebra, and mathematical analysis. Its most basic occurrence is the fact that there are n! ways to arrange n distinct objects into a sequence. This fact was known at least as early as the 12th century, to Indian scholars. Calculate factorial of positive integer in computer with the help of C++.

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