Determinant Prob

This is a discussion on Determinant Prob within the C Programming forums, part of the General Programming Boards category; where does the floating point error: divide by 0 occur can anyone help me with this #include<stdio.h> #include<conio.h> #define LIMIT ...

  1. #1
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    Determinant Prob

    where does the floating point error: divide by 0 occur

    can anyone help me with this


    #include<stdio.h>
    #include<conio.h>
    #define LIMIT 10
    int main()
    {
    int chckdgnl();
    float deter();
    float a[LIMIT][LIMIT],value;
    int i,j,order;
    clrscr();
    printf("Enter order of determent :");
    scanf("%d",&order);
    printf("Enter the elements of the determent :");
    for(i=0;i<order;i++)
    {
    for(j=0;j<order;j++)
    {

    scanf("%f",&a[i][j]);
    }
    }

    if(chckdgnl(a,order)==0)
    value=0;
    else
    value=deter(a,order);
    printf("Determinent Value :%f",value);
    getch();
    }

    float deter(float a[][LIMIT],int forder)
    {
    int i,j,k;
    float mult;
    float deter=1;
    for(i=0;i<forder;i++)
    {
    for(j=0;j<forder;j++)
    {
    mult=a[j][i]/a[i][i];
    for(k=0;k<forder;k++)
    {
    if(i==j) break;
    a[j][k]=a[j][k]-a[i][k]*mult;
    }
    }
    }
    for(i=0;i<forder;i++)
    {
    deter=deter*a[i][i];
    }
    return(deter);
    }


    int chckdgnl(float array[][LIMIT],int forder)
    {
    int i,j,k;
    float nonzero;
    for(i=0;i<forder;i++)
    {
    if(array[i][i]==0)
    {
    for(j=0;j<forder;j++)
    {
    if(array[i][j]!=0)
    {
    k=j;
    break;
    }
    if(j==(forder)) //forder-1
    return(0);
    }
    for(j=0;j<forder;j++)
    {
    array[j][i]=array[j][i]-array[j][k];
    }
    }
    }
    return(0);
    }

  2. #2
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    how do u put the code here with the formatting....when i post it....the indents go away

  3. #3
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    Use the [code][/code] forum bbcode tags.
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  4. #4
    Cogito Ergo Sum
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    Quote Originally Posted by dantu1985 View Post
    how do u put the code here with the formatting....when i post it....the indents go away

    Use the code tags

    It's symbolized by the # sign when you a posting.

  5. #5
    Cogito Ergo Sum
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    My maths isn't that great...but aren't determinants for matrices integers and not floating point numbers?

  6. #6
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    hey pls help me on that floating point error...

    i changed to int...still not working...

    i have mult = a[j][i]/a[i][i]

    so mult is float and so is a array

  7. #7
    and the hat of wrongness Salem's Avatar
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    Closed - for multi posting the same thing without code tags.
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