07Chapter 流程控制2019-11-10

流程控制

程序执行过程中,各条语句的执行顺序对程序的结果是有直接影响的. 即程序的流程对运行结果有直接影响. 流程控制主要有三种

1.顺序结构

2.判断语句

    第一种if

    Notice: The type that can be put in parentheses 

        -- Basic data type(byte short int  char)

        -- Reference data type(String enum) 

        -- The order can be changed at will without affecting the result, even if "default" is modified

3.循环语句

    A loop statement can execute a piece of code repeatedly until the loop condition is not satisfied.

    The four components of a cyclic structure

        one:The initialization statement is initially executed at the beginning of the loop and is executed only once

        tow:Conditional judgment, used to determine whether the cycle continues or not

        three:Looping body, several pieces of code that need to be executed repeatedly

        four:Step statement, the code that needs to be done at the end of each loop