// explanation of & (ampersend) and * (dereference) pointers
main()
{int i=1; int *b; //declare i as intereger and b as pointer to an integer
b=&i; // b is now pointing to i (we load address of i into b)
printf ("%d\n",*b); //print content of location to which b is pointing to.
*b=0; // i is now set to zero since b is pointer to an i;
printf ("%d\n",i); //print i
printf ("%x\n",&i);//print address of i in hexadecimal format.
}