10.9 Give the output of the following program using the four parameter-passing methods of Section 10.3:

int i;

int a[3];

void swap( int x, int y)

{ x = x + y; y = x - y; x = x - y;

}

main()

{ i = 1; a[0] = 2; a[1] = 1; a[2] = 0;

swap(i,a[i]);

printf("%d %d %d %d ", i, a[0], a[1], a[2]);

swap(a[i],a[i]);

printf("%d %d %d ", a[0], a[1], a[2]);

return 0;

}