The concept of variable 0089

6.1 What is a variable

Vernacular: The variable is a box of stuff installed.

Popular: variable is a container for the storage of data. We get the data by the variable name, and even data can be modified.

6.2 variables are stored in memory

    本质：变量是程序在内存中申请的一块用来存放数据的空间。【再给这个变量命名，以便使用变量。】
    类似我们酒店的房间，一个房间就可以看做是一个变量。