Multiplying sequence.

Question

I'm using C++ for this, i'm wanting to be able to input a number, say 5,and output the answer of 5*4*3*2*1. how would I go about doing this?

Answer 1

a general approach...

not in any specific language

a=5
for i from 5 to 1
a=a*i

or

a=5
for i from 1 to 5
a=a*i

or

function factorial(argument):
if argument==1 then return 1
else return argument*factorial(argument-1)

//calling the func.
factorial(5)

Answer 2

Thank you!