Task of Challenge #06/54
Calculate 9! a for-loop .
Solution
Explanation
To create the factorial of 9 we make almost the same as in challenge #05 but with a different loop body code block.
Last time we used this statement to gather the accumulated sum sum+=i. Knowing a bit about mathematics means you are aware of the fact that a factorial is nothing more than a chained multiplication.
So 9! is nothing more than 9*8*7*6*5*4*3*2*1. Together with the knowledge about for-loops we can draw advantages out of this by using the running index of i to create a factorial. To get our desired result, we iterate exact 9 times!
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