How many difference Programming Language feature are your meet?
编程语言的范式 procedural 过程 object oriented 面向对象 functional 函数式 generic 泛型 meta 元编程
ref hello ubuntu, http://ubuntuforums.org/showthread.php?t=497579 https://en.wikipedia.org/wiki/List_of_programming_languages https://en.wikipedia.org/wiki/Comparison_of_programming_languages