Just a little piece of code in C for clearing up pointers… look at the comments in the first part!
(If you need an environment to develop in C on windows, find a solution here: environment for ansi c on windows
[c]
void change(short*, short*);
int main(void) {
short *pointer1 = NULL;
short *pointer2 = NULL;
short value1 = 1111;
short value2 = 2222;
pointer1 = &value1;
pointer2 = &value2;
printf("main – VALUE1:\n");
printf("main – value of value1: %d\n", value1); // Output the value of value1
printf("main – value of value1: %d\n", *pointer1); // Output the value at the address
printf("main – address of value1: %p\n", &value1); // Output the address of value1
printf("main – address of value1: %p\n", pointer1); // Output the value of pointer1 (it’s the address of value1 !)
printf("main – address of pointer1: %p\n", &pointer1); // Output the address(!) of the pointer(!)
printf("\nmain – VALUE2:\n");
printf("main – value of value2: %d\n", value2);
printf("main – value of value2: %d\n", *pointer2);
printf("main – address of value2: %p\n", &value2);
printf("main – address of value2: %p\n", pointer2);
printf("main – address of pointer2: %p\n", &pointer2);
printf("\n*** main – starting change…\n\n");
change(pointer1, pointer2);
printf("\n*** main – changing done!\n\n");
printf("main – VALUE1:\n");
printf("main – value of value1: %d\n", value1);
printf("main – value of value1: %d\n", *pointer1);
printf("main – address of value1: %p\n", &value1);
printf("main – address of value1: %p\n", pointer1);
printf("main – address of pointer1: %p\n", &pointer1);
printf("\nmain – VALUE2:\n");
printf("main – value of value2: %d\n", value2);
printf("main – value of value2: %d\n", *pointer2);
printf("main – address of value2: %p\n", &value2);
printf("main – address of value2: %p\n", pointer2);
printf("main – address of pointer2: %p\n", &pointer2);
return EXIT_SUCCESS;
}
void change(short *valuePointer1, short *valuePointer2) {
printf("change – value of value1: %d\n", *valuePointer1);
printf("change – address of value1: %p\n", valuePointer1);
printf("change – value of value2: %d\n", *valuePointer2);
printf("change – address of value2: %p\n", valuePointer2);
printf("change – changing now…\n");
short h;
h = *valuePointer1;
*valuePointer1 = *valuePointer2;
*valuePointer2 = h;
printf("change – changing done!\n");
printf("change – value of value1: %d\n", *valuePointer1);
printf("change – address of value1: %p\n", valuePointer1);
printf("change – value of value2: %d\n", *valuePointer2);
printf("change – address of value2: %p\n", valuePointer2);
}[/c]