# include <stdio.h>

int main ( )
{
  int a[5] = { 10, 20, 30, 40, 50 };
  int b[5] = { 110, 120, 130, 140, 150 };
  int c = 999;
  int d = 123;
  int e[5] = { 210, 220, 230, 240, 250 };
  int i;
  int f;
//
//  Because B has dimension 10, the array B can be indexed by 0 through 9.
//  You might expect that you would get an error if you wrote an expression
//  like B[-1] or B[12].  
//
//  Let's see.
//
//  If you think about the fact that C will let you say B[12], it makes
//  sense to think that "B" is a place in memory, where B[0] is stored,
//  and that B[1] simply means 1 memory location later, but B[-1] means
//  one memory location sooner.
//
  printf ( "\n" );
  printf ( "Legal entries of B:\n" );
  printf ( "\n" );
  for ( i = 0; i < 5; i++ )
  {
    printf ( "b[%2d] = %3d\n", i, b[i] );
  }
  printf ( "\n" );
  printf ( "What happens if we go too far?\n" );
  printf ( "\n" );
  for ( i = 5; i < 18; i++ )
  {
    printf ( "b[%2d] = %3d\n", i, b[i] );
  }
  printf ( "\n" );
  printf ( "What happens if we go the other way?\n" );
  printf ( "\n" );
  for ( i = -1; -10 <= i; i-- )
  {
    printf ( "b[%2d] = %3d\n", i, b[i] );
  }

  return 0;
}