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#include <stdio.h>
int main()
{
int a, b;
a = 123;
int *a_ptr; // * : asterisk
a_ptr = &a; // & : address-of operator
printf("%d %d %p\n", a, *a_ptr, a_ptr);
*a_ptr = 456; // * : re-direction or de-referencing
printf("%d %d %p\n", a, *a_ptr, a_ptr);
b = *a_ptr;
printf("%d\n", b);
*a_ptr = 789;
printf("%d\n", b);
printf("%d %d %p %p\n", a, *a_ptr, a_ptr, &b);
b = 12;
printf("%d\n", b);
printf("%d %d %p\n", a, *a_ptr, a_ptr);
}
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