Thread: Help needed

Browse this thread from a few days ago.

... or the FAQ:
http://faq.cprogramming.com/cgi-bin/...&id=1043284351

Try explaining what you do understand and what is giving you problems. We will help you understand if we can, but we can't teach from scratch.

A pointer is something that "points" at another variable. What it's doing is storing the memory address of that other variable, and then by using that, the other variable can be found, read, modified, whatever. It might not seem useful, but they're the sine qua non of cool stuff in C/C++.

**p=&a

A pointer to a pointer to a pointer, dereferenced twice (giving you a pointer), being assigned the address of a variable.

++*arr

The pointer is dereferenced, and that value is incremented. This changes what is pointed at.

*++arr

Dereference a pointer. Increment the pointer. This does not effect the dereferenced variable. It simply gives you the contents of the variable, then it increments the pointer.

++**arr+--arr[1][1]

Horrible.
Dereference a pointer to a pointer, increment it (what's there), add to it the decremented value in a two dimensional array. Something like that. (Doing two things at once.)

*t++=*s++

Dereference two variables, make t hold whatever s is at said spot, then increment both pointers.

Quzah.