10 Mar 2013

Inverse_matrix

/*
 
program to find inverse of a matrix...
 
*/
#include<stdio.h>

int main()
{

  int a[3][3],i,j;
  float determinant=0;
  printf("Enter the 9 elements of matrix: ");
  for(i=0;i<3;i++)
     for(j=0;j<3;j++)
        scanf("%d",&a[i][j]);
  printf("\nThe matrix is\n");
  for(i=0;i<3;i++)
     {
      printf("\n");
      for(j=0;j<3;j++)
         printf("%d\t",a[i][j]);
     }
  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]));
   printf("\nInverse of matrix is: \n\n");
   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");
   }
   return 0;
}

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