了解数组的概念，掌握数组的声明、初始化方式,熟练掌握foreach语句的用法，理解params关键字的使用,掌握数组转换方法的使用,理解索引器的概念，掌握在整数索引和在字符串上索引的应用.

-Understand the concept of the array, the array of master declaration, initialization methods, proficiency foreach statement usage, understanding the use of params keyword, master the use of an array of conversion methods, understand the concept of indexers, master integer index and index in the string applications.