How to use the Math class in Java programming

1. Math class

1. The class contains basic mathematical operation methods, such as addition, subtraction, multiplication, division, remainder, etc. They cannot perform complex operations. In the Math class, find Absolute value, square root, trigonometric functions, etc., all classes in the Math class are static and can be called using its class name.

2. Static constants

The Math class contains two static constants, PI and E, which represent mathematical π (pi) and e (natural logarithm) respectively

3. Static constant example

public class p61 { public static void main(String[] args) {         // TODO Auto-generated method stub         System.out.println("PI它的常量值："+Math.PI);         System.out.println("E它的常量值："+Math.E);   } }

The running result is:

2. Math class absolute value

1.Absolute value The characteristic of is a positive number, the absolute value of zero is itself, and the absolute value of a negative number is its opposite.

2. Math class absolute value method:

public static int abs(int a) method: returns the absolute value of int type value;

public static float abs( float a) method: returns the absolute value of the float type value;

public static double abs(double a) method: returns the absolute value of the double type value;

public static long abs(long a ) method: return the absolute value of the long type value;

3. Math class absolute value method example:

import java.util.Scanner; public class p67 { public static void main(String[] args) {         // TODO Auto-generated method stub         System.out.println("请输入一个整数");         Scanner scan=new Scanner(System.in);         int a=scan.nextInt();         if(a>0){             System.out.println("正数绝对值是它本身");             System.out.println(Math.abs(a));         }else if(a<p>The result of the operation is: </p><p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/164/168583812524231.png" class="lazy" alt="How to use the Math class in Java programming"></p> <h4 id="Maximum-value-of-Math-class">3. Maximum value of Math class</h4><p>1. The method of maximum value of Math class is to compare which of the two values ​​is larger. </p><p>2.Math class maximum value method: </p><p>public static int max(int ​​a, int b) method: Get the maximum value of two int type values;</p><p>public static float max(float a, float b) method: Get the maximum value of two float type values; </p><p>public static double max(double a, double b) method: Get the maximum value of two double type values ;</p><p>public static long max(long a, long b) method: Get the maximum value of two long type values;</p><p>3. Example of the maximum value method of Math class</p><pre class="brush:php;toolbar:false">import java.util.Scanner; public class p68 { public static void main(String[] args) {         // TODO Auto-generated method stub         System.out.println("请输入二个整数");         Scanner scan=new Scanner(System.in);         int a=scan.nextInt();         int b=scan.nextInt();         System.out.println(a+"和"+b+"的最大值是："+Math.max(a, b));   } }

Run result:

4. Math class minimum value

1. The Math class minimum value method is to compare two values ​​which is smaller.

2. Math class minimum value method:

public static int min(int a, int b) method: Get the minimum value of two int type values;

public static float min(float a, float b) method: Get the minimum value of two float type values;

public static double min(double a, double b) method: Get the minimum value of two double type values Value;

public static long min(long a, long b) method: Get the minimum value of two long type values;

3.Math class minimum value method example:

import java.util.Scanner; public class p69 { public static void main(String[] args) {         // TODO Auto-generated method stub         System.out.println("请输入二个整数");         Scanner scan=new Scanner(System.in);         int a=scan.nextInt();         int b=scan.nextInt();         System.out.println(a+"和"+b+"的最小值是："+Math.min(a, b));   } }

The result of the operation is:

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