can someone get me started on calculating n! I think i should use a for loop.
can someone get me started on calculating n! I think i should use a for loop.
where is the variable n used?
you need an equation
like
5 = 2 + n
or
2(n) + 12938109283109283 = 3094809384503985
Hehe I think the Wooike misunderstood the question!
n! = 1 * 2 * 3 * ... * n
If you know how to write for-loops this should be a piece of cake.
Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling
By definition n factorial is...
n! = n * (n - 1) * (n - 2) * ... 1
The one at the end comes from the base case of 0! which is equal to 1. Have fun.
"...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers
i think you mean n factorial. probably one of the easiest ways is to use a recursive function...try it, then post your code...
it shouldn't be too long...
Last edited by alpha; 11-19-2002 at 03:32 PM.
#include <iostream.h>
#include <stdio.h>
unsigned int f,x=0;
unsigned int factorial(unsigned int a);
int main(void)
{
int hold;
puts("Please enter an integer value: ");
scanf("%d", &x);
{2
f=factorial(x);
printf("%u factorial equals %u\n\n", x,f);
}
cin >> hold;
return 0;
}
unsigned int factorial(unsigned int a)
{
if(a==1)
{
return 1;
}
else
{
a *=factorial(a-1);
}
return a;
}
You don't need a recursive function for that..Originally posted by alpha
i think you mean n factorial. probably one of the easiest ways is to use a recursive function...try it, then post your code...
it shouldn't be too long...
oooooooooo woops,Originally posted by Sang-drax
Hehe I think the Wooike misunderstood the question!
n! = 1 * 2 * 3 * ... * n
If you know how to write for-loops this should be a piece of cake.
i thought he meant like
"help me!"
I know you don't need a recursive function for it, I think its a cooler way of doing it though...and possibly shorter, im not sure because i haven't written factorial using a for loop since a few months ago...Originally posted by Captain Penguin
You don't need a recursive function for that..
For fun, here's the definition of z! when z is a real or complex number:Originally posted by MrWizard
By definition n factorial is...
n! = n * (n - 1) * (n - 2) * ... 1
The one at the end comes from the base case of 0! which is equal to 1. Have fun.
When z is a negative integer, z! = infinity
Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling
cooler? who cares, its sloooooooooooow.Originally posted by alpha
I know you don't need a recursive function for it, I think its a cooler way of doing it though...and possibly shorter, im not sure because i haven't written factorial using a for loop since a few months ago...
hello, internet!
ewwwwww...Originally posted by Sang-drax
For fun, here's the definition of z! when z is a real or complex number:
When z is a negative integer, z! = infinity
can you convert that to c code so i can understand it?
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Yep, this is more than sufficient:Originally posted by moi
cooler? who cares, its sloooooooooooow.
Code:int main() { int n; int ans = 1; cin >> n; for(int x = n; x > 0; x--) { ans = ans * x; } cout << ans; }
okay, i didn't know it was that much slower. i recently just kindof taught myself recursion, so I like using it for the time being...I'll get over the phase, hehe...