掌握算法的三种基本控制结构：顺序结构、选择结构、循环结构。熟悉if语句、switch语句、while语句、do-while语句和for语句的语法形式，并正确的掌握这几种语句的使用方法。能运用算法的三种基本结构编写程序。-Master algorithm three basic control structures: the order of the structure, choice of structure, the cycle structure. Familiar with if statements, switch statements, while statements, do-while statements and for statements of grammatical form, and correctly grasp of these types of statements to use. Algorithm to use the three basic structure of programming.