Learn java Lesson 8: operators (1)

zyqok 2020-11-13 10:16:58
learn java lesson operators


【 Related links 】

Last one : Xiaobaixue Java The first 7 course : Basic data type

Next : Xiaobaixue Java The first 9 course : Operator ( Two )

general programme : Returns a list of

 

【1】 What is an operator

So called operator , They are symbols that can participate in the operation , In our daily life , Common operators include Add 、 reduce 、 ride 、 except . So in the program , What operators are there ? Let's take a look at . Let's create a new class Test08

【2】 Operator classification

【2.1】 Arithmetic operator

(1) Add ( + )

public static void main(String[] args) {
// Create variables x, And assign the initial value to 10
int x = 10;
// Create variables y, And assign the initial value to 5
int y = 5;
// Use operators to operate
int z = x + y;
// Print the result of the calculation
System.out.println(" The result of the calculation is :" + z);
}

We copy the above code into the class , Then execute the program , You can see ,x and y The result of the addition is 15

(2) Subtraction ( - )

(3) Multiplication ( * )

(4) division ( / )

(5) Self - increment operator (++)

The self increasing operator is to add 1

Add one more time +1, The auto increment operator is added once more after two times , For example, below

x ++ Yes, it will x Add yourself 1;

So this is equivalent to : x = x + 1;

It can be interpreted as :x Add to yourself first 1, And then assign the result to yourself , When there is an assignment operator ( namely =) when , The program computes first "=" On the right .

 

(6) Self reduction ( -- )

Self decreasing and self increasing are used in the same way , opposite

(7) Modular arithmetic ( % )

Modular arithmetic , It's also called surplus budget , such as 10 / 3 The remainder is 1,13 / 3 The remainder of is also 1, This 1 It's the result of modular operations .

For example, give you a three digit integer , Let's find out what the single digits are ? So, if we want to find this digit number ?

At this time , We can get the result by modulo , We're going to model the three digits 10.

such as 327 This three-dimensional number , He Mo 10 Namely 327 % 10, The end result is 7, That's the single digit .

Let's look at the program code as follows :

 

【2.2】 Assignment operator  

The assignment operation ( = )

So called assignment budget , It is to assign a value to a variable directly , Actually x The assignment budget is also used in initialization , The initial assignment is 10.

【2.3】 Comparison operator

So called comparison operator , That is, we often use greater than in our life , Less than , be equal to , It's not equal to , Greater than or equal to , Less than or equal to these .

The result of these operators is only two results , Either it's right true, Either it's a mistake false, So we can use a boolean Type to receive their comparison results .

(1) Greater than ( > )

notes : There is a priority for multiple budget operators to participate in the operation , like 3 + 2 - 5 * 0 equally , Let's start with multiplication and division , Add and subtract again .

We can use parentheses , To declare the operation priority , That is, there are parentheses , Give priority to the results in parentheses .

You can see ,x > y ( namely 10 Greater than 5) The result is true, namely x > y Yes. . 

(2) Less than ( < )

(3) be equal to ( == )

Two assignment operators are linked together to indicate equal to , Let's keep this in mind , Although in our daily life, it is often written as 1 individual =, But in the program ,1 individual = It's the assignment symbol . In order to distinguish between , Is designed to be 2 individual =.

The arrow code below is understood as : take x and y Is it equal or not , The result of the comparison is assigned as z,x by 10,y by 5, Obviously, the two are not equal , So the result of the assignment is false;

(4) Greater than or equal to ( >= )

(5) Less than or equal to ( <= )

(6) It's not equal to ( != )  

 

【 Related links 】

Last one : Xiaobaixue Java The first 7 course : Basic data type

Next : Xiaobaixue Java The first 9 course : Operator ( Two )

general programme : Returns a list of

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