Function features: calculating a positive integer n the factorial n!.* N! = N* (n-1)* (n-2)* ...* 1* function parameters: n, that is to calculate the factorial of a positive integer, required n to meet:* 0 < n < 100* return value : If the input parameter is not correct, return-1,* otherwise calculate n! get the results

jisuanjiecheng.cpp

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