I need to write a program that read of input a number N numbric & calculate N! that's number (should be simulator of multiply into program because us want number N )
& should be Number of character for e.g char s[20].

EDIT: deleted my explanations because I agree with Salem...also, could you try to be a little clearer with your question (I find it difficult to understand). And try some google searches...you can easily find an in-depth explanation of factorial, C++ i/o (reading from the console), etc...

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