overflow problem

This is a discussion on overflow problem within the C Programming forums, part of the General Programming Boards category; Code: 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 ...

  1. #1
    /*enjoy*/
    Join Date
    Apr 2004
    Posts
    159

    Wink overflow problem

    Code:
    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[
    Code:
    --------- no recursion function please---------------
    [\quote ]
    Last edited by enjoy; 10-17-2004 at 05:49 PM. Reason: n...

  2. #2
    Registered User
    Join Date
    Oct 2004
    Posts
    11
    Code:
    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.

    Code:
    int i, j,n;
    
    j = 5; n = j-1;
    
    for (i=n; i>0; i--)
     j*=i;
    Ryan

  3. #3
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    Code:
    sorry about missing
    scanf("%i",&n);
    the problem percist with n==13
    ....!!!

  4. #4
    Registered User
    Join Date
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    536
    Quote Originally Posted by enjoy
    Code:
    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

  5. #5
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    ..... !!!!

  6. #6
    .
    Join Date
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    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

  7. #7
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    Quote Originally Posted by 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

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

    Regards,

    Dave

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