# include <stdio.h>

int main ( )
{
  int a[3][3] = { { 1, 2, 3 }, 
                  { 2, 0, 1 },
                  { 1, 1, 1 } };
  int b[3];
  int i;
  int j;
  int x[3] = { 1, 2, 3 };
//
//  Compute A*x = b.
//
  for ( i = 0; i < 3; i++ )
  {
    b[i] = 0;
    for ( j = 0; j < 3; j++ )
    {
      b[i] = b[i] + a[i][j] * x[j];
    }
  }
//
//  Print the result.
//
  for ( i = 0; i < 3; i++ )
  {
    printf ( "%i\n", b[i] );
  }

  printf ( "\n" );
  printf ( "  Correct answer is {14,5,6}.\n" );

  return 0;
}