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Given an integer, n, recursively multiply by n-1 until n is 1.

unsigned long long fact (unsigned long long n) {

return (n>1)?n*fact (n-1):1;

}

Note that an unsigned long long integer of 64 bits length can only accommodate factorials up to n=21. To cater for anyinteger you will need to use a variable-length integer type. The C language does not provide one as standard, but you will find third-party libraries that can cater for huge integers, typically storing the integer as a variable-length string.

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