General Protection Exception error

[subhasree]

Hi,

I am a student of mathematics and quite new to programming in C. I am trying to write a code to construct an array which at every step has to compare the value of the current element with all the existing elements in the array.

The code is compiling without error. However whenever I try to run it, I get General Protection Exception.

Here is my code:

#include <stdio.h>
#include <conio.h>
#include <math.h>
 
float admval(float *m, float p, int q);
 
void main(){
int dim=0, i=0, j=0, k=0, l1=0, temp1=0, ndone=0, mav =0;
int i1=0, kj=0, ij=0, jj=0, sd=0;
int seq[30];
float rel[30][30];
float tol[30], done[30], at[30], mava[30];
float minmav=0;
//float admval(float *m, float p, int q);
printf("Enter the dimension of matrix \n");
scanf("%d", &dim);
for (i=0;i<dim;i++)
{
for(j=0;j<dim;j++)
{
printf("Enter the %d%d th element of the matrix \n", i,j);
scanf("%f", &rel[i][j]);
}
}
 
for (i=0;i<dim;i++)
{
for(j=0;j<dim;j++)
{
printf("The %d%d th element of the matrix is %f \n", i, j, rel[i][j]);
}
}
 printf("Enter the sequence of elements of the matrix \n");
 for(k=0; k<dim; k++)
 {
  scanf ("%d", &seq[k]);
 }
 printf("the sequence is \n");
 for(k=0; k<dim; k++)
 {
  printf ("%d \n", seq[k]);
 }
 l1=seq[0]-1;
 tol[l1] = rel[l1][l1];
 done[0] = 1;
 ndone =1;
 printf("av is %f", tol[l1]);
 
 for (i1=0; i1<dim; i++)
 {
  if (ndone==dim)
    {
     goto l1;
    }
  for (kj =0; kj<dim; kj++)
  {
    ij=seq[kj];
    if (done[ij] ==0)
    {
        goto l2;
    }
  }
  }
 
 l1:
    printf("results :");
    for (i=0; i<dim; i++)
    {
        printf("\n %f", at[i]);
    }
 
 l2:
    sd=1;
    goto l4;
    for (jj=0; jj<dim;j++)
    {
        if ((jj == ij) ||( done[jj] == 0))
        {
            goto l3;
        }
        else if(at[jj]>rel[jj][ij])
        {
          mav = rel[jj][ij];
         }
        else
        {
            mav=rel[ij][jj];
        }
        sd= sd+1;
        mava[sd]=mav;
        printf("mav = %f", mav);
     l3:
    }
    minmav =5000;
    admval(mava, minmav, ndone);
  l4:
  printf ("now computing .....");
    temp1=rel[ij][ij];
    mava[sd]= temp1;
//   l2=0, d=0,
 //for(k=1;k<dim;k++)
 //{
 //l2=seq[k]-1;
// admval(l1,l2);
//temp1= tol[l1];
//temp2= rel[l1][l2];
// if (tol[l1] <= rel[l1][l2])
      //    av[l2]= rel[l2][l2];
 
// else
     //{
      //    av[l2]= rel[l1][l2];
 //    }
 
//done[d]=l2;
//d++;
 
 
 // }
}
 
float admval (float m[], float p, int q)
{
  int kk;
  for (kk=0; kk< q+1; kk++)
  {
    if (m[kk]< p)
    {
        p=m[kk];
    }
  }
  return(p);
  }
 

Hope somebody can help me.

Thanks in advance

[newb16]

Works fine for me using cygwin.

[donbock]

@subhasree
You should validate the dim input to make sure it is legal (1 <= dim <= 30). There are other operator inputs (for instance seq) that should be validated too; although their legal ranges may differ from that of dim.


@subhasree
Curiously, "%f" converts a float in scanf, but a double in printf. Try adding an explicit cast to double in the printf line. You have several other printf lines with the same potential problem.


@subhasree
You probably meant to increment i1 rather than i.


@subhasree
Variables and labels are in different namespaces so it is legal and unambiguous to use the same name for both. However, people tend to get confused so the practice is frowned on.


@subhasree
You will never get to the for loop.


@subhasree
You probably meant to increment jj rather than j.

@subhasree
I haven't analyzed the code so I don't know, but how big do you expect sd to get? Is it bound by dim or by dim^2? If the latter then you need to increase the array size in the array definition accordingly.