Linked lists in data structures c++

I need to write a program in c++ that reads a polynomial expression from a .txt file and put that expression into a linked list, e.g 4.0x^5 + -2.0x^3 + 2.0x + 3.0 (expression on .txt file)

First node of linked list will be like:

head->[4][5]["address of next node]-> Thanks.