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Variable definition and use

2022-04-23 03:28:00 【Aiyou coffee】

Overview of variables ：

Definition of variables ： While the program is running , The amount of value that can change .

Variables are essentially a small area of memory .

Variable The definition of ：

Variables are defined by variable names , data type , The variable value consists of three parts .

So the format is ： data type Variable name = A variable's value ：

for example int a = 3;

Use of variables ：

Modify the format ： Variable name = A variable's value

public class variable{
    public static void main (String []args){
    // Define a variable 
    int a = 1:
    // Output 
    System.out.println(a);
    // Modify variables 
    a =23;
    // Once again, the output 
    System.out.println(a);
    }
}

This is the process of defining and modifying variables .

matters needing attention ：

1. The name cannot be repeated

2. You can't use variables without assignment

3.long When a type is defined, it should be followed by an uppercase L

4.float Type to prevent incompatibility , So add... After it F

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