推荐给需要学习C语言的初学者，内有网站是北大程序员测试题 的集合，本文档里面介绍了题目的难易程度-Recommend to beginners need to learn the C language, within the site is a collection of of Peking programmers test questions in this document which describes the degree of difficulty of the subject

易语言编程系统TXT(无私奉献) -The Yi language programming system TXT (selfless dedication)