Pointer Arithmetic

We can manipulate the pointers too. We can perform operations such as addition, subtraction, increment and decrement etc.,. As the pointer variables have address, adding or subtracting a number results in another address, which is at an offset from the original address. This may be memory address occupied by another variable.

e.g.

                int   i, j, k ;

                int  *iptr = &i;

                *iptr = *iptr + 2;  // I = I + 2;

                 iptr = iptr + 2 // adds 2 to address.

These are useful when using arrays.

e.g.

arr[10];

int *iptrb = &arr[0];

int *iptre = &arr[10];

While ( iptrb != iptre)

     {        

 Do something with the value if (*iptrb);

++iptrb;

}