The C Programming Language - Pointers

The address of var is now displayed on the far left. The content of var is represented
as a hexadecimal value in the first 4 bytes, with the first byte on the right at position
1. The decimal number 1234567 corresponds to the hexadecimal number 0x0012d687,
which is stored at address 0x61ff1c in this example.
In the next example, we declare a pointer variable of type int named ptr and assign it
the address var. In the next line of code, we use the dereference operator * to access
the variable pointed to by ptr, and store its contents in x. We then output the
corresponding values.
/* example 126 – pointers */
#include
int main()
{
int var = 1234567, x;
int *ptr; // ptr is an int pointer
ptr = &var;
x = *ptr;
// ptr = address of var
// x = value of element pointed to by ptr
printf("The value of x = %d\n", x); // x holds the value of var
printf("The address of var = %p\n", ptr);
printf("The address of x = %p\n", &x);
printf("The address of ptr = %p", &ptr);
}
return 0;
The value of x = 1234567
The address of var = 0061ff1c
The address of x = 0061ff18
The address of ptr = 0061ff14
The pointer variable ptr itself must of course also have a place in memory and was
created here at address 0x0061ff14.
The C Programming Language by Heimo Gaicher – Chapter Pointers 8