Coding Practice

• BigNumberArithmetic
  Arithmetic operations of big intergers,which are in the format of string.

• ExcelColumnNumber
  Transformation between Column and Interger.

• Fibonacci number
  What are Fibonacci numbers?.

• TrailingFactorialZeros
  Find the number of trailing zeros of a Factorial.

• Quick Sort
  [http://wwwx.cs.unc.edu/~zhew/Leetcoder/]

• Expr
  Evaluate the string expression, which is combined with single digit positive integers and arithmetic operators including + - * / ( )

Reference

• Dependency Injection
  Dependency Injection
  Martin Fowler
  Strategy Pattern

• Design Patterns
  Computer Science Design Patterns
  OO Design

• Functional Programming
  Functional Programming Intro
  Functional Programming With Python
  The Y combinator
  The Y Combinator (Slight Return)