第三周作业-循环与判断语句

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类名：MathDemo

public class MathDemo {public static void main(String[] args){System.out.println("abs(-5)="+Math.abs(-5));System.out.println("max(6.75,3.14)="+Math.max(6.75,3.14));System.out.println("min(100,200)="+Math.min(100,200 ));System.out.println("round(3.5)="+Math.round(3.5));System.out.println("round(-6.5)="+Math.round(-6.5));System.out.println("sqrt(2)="+Math.sqrt(2));System.out.println("pow(2,5)="+Math.pow(2,5));System.out.println("E="+Math.E);System.out.println("exp(2)="+Math.exp(2));System.out.println("log(2)="+Math.log(2));System.out.println("ceil(6.75)="+(int)Math.ceil(6.75));System.out.println("floor(6.75)="+(int)Math.floor(6.75));System.out.println("Pi="+Math.PI);System.out.println("sin(Pi/4)="+Math.sin(Math.PI/4));System.out.println("cos(1)="+Math.cos(1));}}

public class LoopExample  {   public static void main(String[] args)    {      int lay=4;       for(int i=1;i<=lay;i++)     {     for(int k=1;k<=lay-i;k++)      {     System.out.print(" ");     }       for(int j=1;j<=2*i-1;j++)     {     System.out.print("*");     }     System.out.println( );       }    }  }

类名：CalculatePi

public class CalculateP {public static void main(String args[]){double sum = 0.0;for(int i = 1; i <= 70000000; i +=4){sum += (1.0/i - 1.0/(i+2));}        double pi = 4*sum;System.out.println("pi="+pi);} }

类名：LeapYear

import java.util.Scanner;public class LeapYear {public static void main(String[] args){//Creat a ScannerScanner input = new Scanner(System.in);System.out.print("Enter a year:");int year = input.nextInt();//Check if the year is a leap yearboolean isLeapYear=(year % 4 ==0 && year % 100 !=0) || (year % 400 == 0);//Display the resultSystem.out.println(year + "is a leap year?" + isLeapYear);}}

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