C - pointer

Description : Pointer
When I announce a variable " int *ptr."
Ptr mean this is a address.
This is a integer address.
If I want assign a value, it must be a address to assign to ptr.

#include 

int j, k;
int *ptr;

int main(void)
{
    j = 1;
    k = 2;
    ptr = &k;
    printf("\n");
    printf("j has the value %d and is stored at %p\n", j, &j);
    printf("k has the value %d and is stored at %p\n", k, (void *)&k);
    printf("ptr has the value %p and is stored at %p\n", ptr, (void *)&ptr);
    printf("The value of the integer pointed to by ptr is %d\n", *ptr);

    return 0;
}

Reference :
http://pw1.netcom.com/~tjensen/ptr/ch1x.htm