New program need help with factorials

I need to know how to find the factorial (5!=125) of a variable and, using it and for loops, put all of the possible combinations in an array.

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Originally Posted by AdamLAN

I need to know how to find the factorial (5!=125) of a variable

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Use a loop to calculate the factorial.

Quote:

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Originally Posted by AdamLAN

and, using it and for loops, put all of the possible combinations in an array.

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Huh? Combinations of what into the array?

factorial of x is x*factorial(x-1), and factorial 0 is 1
have fun... I'd sugest a cicle instead of recursion... recursion does functions call, which have a big overhead and use lots of stack.

Quote:

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Originally Posted by AdamLAN

5!=125

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Close... 5! = 120.

AdamLAN,

Do you know what a factorial is? Can you do it by hand or on a calculator? ... I mean a calculator without a factorial button.

5! means 1 x 2 x 3 x 4 x 5 = 120. (Of course, that's NOT C++ because x does NOT mean multiply in C++.) :)

Step 1
If you can't figure-out the whole program, how about starting with a loop that generates the sequential integers 1 thru n: 1, 2, 3, 4...

Step 2
When that's working, add the code to calculate the factorials.

Step 3
When you get that working, add the array stuff.

I assume that by "all the possible combinations" you mean this all of the factorials up to n: 1, 2, 6, 24...