Think about the huge changes caused by variables

   Variables are too common in computer programming , There are two kinds of 5+6 The code writing method of reflects the difference between not using variables and using variables .

• Writing a ：

public static void main(String[] args) {
    
    System.out.println(5+6);
}

• Write two ：

	public static void main(String[]args){
    
		int a = 5;
		int b = 6;
		System.out.println(a+b);
	}

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Change one ： Finite to infinite

   Writing method 1 shows the addition of two fixed numbers , Writing method 2 shows the addition of two variables , From finite to infinite, there are two aspects ：

• aspect 1： From adding two fixed numbers to adding any two numbers
• aspect 2： Add from two numbers to any number
  
  

Change 2 ： Encapsulation of algorithms

   As soon as the writing method is shown, what is printed is 5+6 Result , Writing method 2 shows that what is printed is a+b Result . Writing method 2 has an algorithm encapsulated idea in it , Addition is included in the algorithm , Because addition is also an accurate and complete description of the solution .

Change three ： Multiplexing of addition

   Writing method 2 makes addition into a template , This template can be reused wherever addition is required .

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   Writing 2 introduces two simple variables a and b There have been so many changes , If you have other ideas about writing method 2, please post them in the comments .