Let's say you entered 5, so it will run till 1.
First iteration will be: while 5>0 which is true
fact = fact * 5 while remember fact = 1 so answer will be
fact = 1 * 5
Then number will reduce to -1 i.e. 4
This will repeat until the condition is met.
The final answer looks like as: 5*4*3*2*1 = 120
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