Pointer Arithmetic [closed]

Answer 1

This is one pretty good at link here about Pointer Arithmetic

For example:

Pointer and array

Formula for computing the address of ptr + i where ptr has type T *. then the formula for the address is:

addr( ptr + i ) = addr( ptr ) + [ sizeof( T ) * i ]

For for type of int on 32bit platform, addr(ptr+i) = addr(ptr)+4*i;

Subtraction

We can also compute ptr - i. For example, suppose we have an int array called arr. int arr[ 10 ] ; int * p1, * p2 ;

p1 = arr + 3 ; // p1 == & arr[ 3 ] 
p2 = p1 - 2 ; // p1 == & arr[ 1 ]