Howto compute the factorial of x

Question

how to get the value of an integer x, indicated by x!, it is the product of the numbers 1 to x.

Example: 5! 1x2x3x4x5 = 120.

Answer 1

how to get the som of an integer x, indicated by x!, is the product of the numbers 1 to x.

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Change d = d*a; to d = d*b inside the loop