int   a [7] = { 3,5,2,7,9,10,11}

  int list[5]; 

Variable         Memory addres

List[0]            base address = a

List[1]                a+1*sizeof(int)

List[2]                a+2*sizeof(int)

List[3]                a+3*sizeof(int)

List[4]                a+4*sizeof(int)