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pointer_arithmetic.md

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Pointer Arithmetic Cheatsheet

Address-Of

?inline &x
⇒ pointer to x

Indirection

?inline *p
⇒ what p points to

Comparison

?inline p0 < p1
⇒ true iff p0 comes before p1 in array

Difference

?inline p0 - p1
⇒ distance, in elements, ptrdiff_t

Offset

?inline p + offset
⇒ Nth pointer after/before p

Subscript

?inline p[offset]
⇒ Nth object after/before p[0]

Equivalences

?inline

  &*p == p
 p[i] == *(p + i)
&p[i] == p + i
   *p == p[0]

General Advice

?inline To better understand, you can think of pointers as memory addresses. At a hardware level, they are indices in a huge byte array that makes up your computer's memory.

Footer

?footer Note: Using the indirection operator * is called "dereferencing"
Note: p + 1 will offset p by one element, which can be an offset of multiple bytes