overflow problem

[enjoy]

int main()
{
int i,j=1,n;
printf("donnez n\n");
for(i=0;i<n;i++)

{

j*=(n-i);

}

printf("%i!=%i",n,j);

return 0;
}

[quote]
my program has a problem with integers (< =13)

i need help !!!
i want a function that calcul factoriel(n) with n >>]0,+00[

--------- no recursion function please---------------

[\quote ]

[PrimeTime00]

int i,j=1,n;
printf("donnez n\n");
for(i=0;i<n;i++)

Your n needs some sort of value.

If you want to calculate the factorial of j,
set j as the number you want to factorial.
and the n = j-1.

int i, j,n;

j = 5; n = j-1;

for (i=n; i>0; i--)
 j*=i;

Ryan

[enjoy]

sorry about missing
scanf("%i",&n);

the problem percist with n==13
....!!!

[Dave Evans]

sorry about missing
scanf("%i",&n);

the problem percist with n==13
....!!!

13 Factorial is greater than 2 to the power 32.

Can't be represented as a 32-bit integer.

Regards,

Dave

[enjoy]

..... !!!!

[jim mcnamara]

If your compiler supports it, try using long long variables.

Generally, if you need to work with huge numbers you need to have a bignum library like GMP from www.gnu.org

[Dave Evans]

If your compiler supports it, try using long long variables.

Generally, if you need to work with huge numbers you need to have a bignum library like GMP from www.gnu.org

64-bit ints will take you all the way to 20 factorial.

Regards,

Dave