A list iterator is an object that accesses the elements in a list in their position of order.
The list class includes iterator as a nested class within its declaration.

The operators of the class list::iterator are
*, ++, --, ==, !=
(Please apply the concept of pointers to iterator)

There are two functions in the class list that return iterator datatype:

• iterator begin();

Return an iterator that references the first position(front) of the list.
• iterator end();

Return an iterator that point to nil, the position after the back.

using namespace std;

void main()
{
 list<double> DayIncome(5,0);
 list<double>::iterator ptr;
 ptr = DayIncome.begin();

 for(int i=1; i<6; i++)
 {
     *ptr = *ptr + i*5;
      ptr++;
 }

 ptr = DayIncome.begin();
 while( ptr != DayIncome.end())
 {
    cout<<*ptr<<endl;
    ptr++;
 }
}