Thread: store data in binary file then use binary file to find inverse of matrix form of data

anyone help my program isn't working. I need to find inverse of a matrix data in binary file should be used to form matrix.its not finding inverse correctly rest is working good.

Code:

#include <stdio.h>


void createbin();
void display();
void inverse();


int main()
{
    createbin();
    display();
    inverse();


    return 0;
}




void createbin()
{
    int a[3][3],i,j;
    int x;
    FILE *fp = fopen ("file.bin", "wb");




    printf("Enter 9 numbers: ");
  for(i=0;i<3;i++)
      for(j=0;j<3;j++)
           scanf("%d",&a[i][j]);
           fwrite (&x, sizeof (x), 1, fp);
    fclose(fp);


}


void display()
{
    int a[3][3],i,j;
    float determinant=0;
    int x;


    printf("\nThe matrix is\n");
  FILE *fp = fopen("file.bin","rb");
  while(1 == fread (&x, sizeof (x), 1, fp))
  {
  for(i=0;i<3;i++)
    {
      printf("\n");
      for(j=0;j<3;j++)
           printf("%d\t",a[i][j]);
        }
  }

   fclose(fp);
   
}

void inverse()
{
    int a[3][3],i,j,x;
    float determinant=0;


    FILE *fp = fopen("file.bin","rb");


       printf("\nInverse of matrix is: \n\n");


  while(1 == fread (&x, sizeof (x), 1, fp))
        for(i=0;i<3;i++)
      determinant = determinant + (a[0][i]*(a[1][(i+1)%3]*a[2][(i+2)%3] - a[1][(i+2)%3]*a[2][(i+1)%3]));




   for(i=0;i<3;i++)
    {
      for(j=0;j<3;j++)
           printf("%.2f\t",((a[(i+1)%3][(j+1)%3] * a[(i+2)%3][(j+2)%3]) - (a[(i+1)%3][(j+2)%3]*a[(i+2)%3][(j+1)%3]))/ determinant);
       printf("\n");
    }


}

> fwrite (&x, sizeof (x), 1, fp);
But the value you read from the user is stored somewhere else.

> while(1 == fread (&x, sizeof (x), 1, fp))
Yet you print something else instead.

Rather than mashing everything together, write a specific function to write a matrix to a file.
No printf or scanf calls, just a for loop and fwrite.

Then do the same for reading a matrix from a file.