One convention that we have is to use the names of fruits and vegetables for variables(only in small code frsgments,nout in any real program,of course). 一个约定我们使用水果和蔬菜的名称作为变量. converntion 约定  variables 变量   frsaments char pear[40];  梨 double peach;  桃…

Active Record: ORM ( Object-relational Mapping)Bridges the gap between relational databases , which are designed around mathematical Set Theory and Object Oriented programming languages that deal with objects and their behavior * Greatly simplifies w…