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Pointer Arithmetic

You can perform arithmetic on pointers, but it's different from regular math. Incrementing a pointer moves it by the SIZE of the data type it points to.

ptr++

Moves to the next memory location of the type

ptr--

Moves to the previous memory location of the type

ptr + n

Moves n elements forward

ptr1 - ptr2

Number of elements between two pointers

HOW IT WORKS

If an int is 4 bytes and ptr is at 1000:

ptr + 1; // Address becomes 1004 (not 1001!)

INVALID OPERATIONS

You cannot multiply or divide pointers. You also cannot add two pointers together (that address wouldn't mean anything).

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