JAVA程式語法_數學運算

數學運算

先來個  四則運算 搭配  printf  輸出  暖身

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/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package myapp; import java.util.Scanner; /** * * @author chous */ public class MyApp { /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here Scanner input = new Scanner(System.in ); double d1 , d2 ; System.out.println("Please input first double num"); d1 = input.nextDouble(); System.out.println("Please input second double num"); d2 = input.nextDouble(); double addResult , subResult , multiResult , divResult; addResult = d1 + d2; subResult = d1 - d2; multiResult = d1 * d2; divResult = d1 / d2; System.out.printf("The result of Adding %f to %f is %f\n" ,d1,d2,addResult); System.out.printf("The result of Subtracting %f to %f is %f\n" ,d1,d2,subResult); System.out.printf("The result of Multiplying %f to %f is %f\n" ,d1,d2,multiResult); System.out.printf("The result of Dividing %f to %f is %f\n" ,d1,d2,divResult); input.close(); } }

OK  那其實  還有很多我們可能會需要用到的較為複雜
數學運算

https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html

Math 程式區域

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/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package javamath; import java.util.Scanner; /** * * @author chous */ public class JAVAMath { /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here Scanner input = new Scanner(System.in); System.out.println("Please input any decimal number"+ "(positive or negative)"); System.out.println("input num1:"); double n1 = input.nextDouble(); System.out.println("input num2:"); double n2 = input.nextDouble(); //absolute value System.out.printf("The absolute value of %f is: %f\n" ,n1 ,Math.abs(n1)); System.out.printf("The pow (squared) value of %f is: %f\n" ,n1 ,Math.pow(n1,2)); System.out.printf("The pow (cubed) value of %f is: %f\n" ,n1 ,Math.pow(n1,3)); //max System.out.printf("The maximum value of %f and %f is: %f\n" ,n1 ,n2 ,Math.max(n1,n2)); //min System.out.printf("The minimum value of %f and %f is: %f\n" ,n1 ,n2 ,Math.min(n1,n2)); //ceiling value -->天花板函數 ceil(x) //不小於x的最小整數，如ceil(0.5)=1, ceil(-2.5)=-2,ceil(3.5)=4, ceil(10)=10 System.out.printf("The ceiling value of %f is: %f\n" ,n1 ,Math.ceil(n1)); //floor value -->地板函數 floor(x)又稱「高斯函數」(向下取整/向下舍入) //不大於x的最大整數，如 [0.9]=0, [5.1]=5,[-1.5]=-2, [19]=19 ,[4.99]=4,[-3.4]=-4 System.out.printf("The floor value of %f is: %f\n" ,n1 ,Math.floor(n1)); //log (base 2) System.out.printf("The Log base 2 value of %f is: %f\n" ,n1 ,Math.log(n1)); //log (base 10) System.out.printf("The Log base 10 value of %f is: %f\n" ,n1 ,Math.log10(n1)); System.out.printf("The round value of %f is: %d\n" ,n1 ,Math.round(n1)); //hypot value --> 三角形斜邊 double sideX , sideY; System.out.println("Input the x-side values of Triangle:"); sideX = input.nextDouble(); System.out.println("Input the y-side values of Triangle:"); sideY = input.nextDouble(); System.out.printf("The hypotenuse value of %f and %f is: %f\n" ,sideX ,sideY ,Math.hypot(sideX,sideY)); } }