第四周作业-键盘输入数据 和 数据类型
来源：互联网 发布：java poi 合并单元格 编辑：程序博客网 时间：2024/05/19 02:28
public class ComputerArea{public static void main(String args[]){final double PI=3.14159;double area;area =PI*10*10;System.out.println("The area for the circle of 10 is"+area);}}
import java.util.Scanner;public class ComputerArea2{public static void main(String args[]){final double PI=3.14159;double area;double radius =0.0;//输出提示符System.out.println("请输入一个浮点数(如果数字<=0,则结束)");Scanner sc =new Scanner(System.in);while(sc.hasNextDouble()){radius=sc.nextDouble();//请输入double数值，如果<=0,则结束if(radius<=0)break;//计算圆面积area =PI*radius*radius;System.out.println("The area for the circle is"+area);//输出提示符System.out.println("请输入一个浮点数(如果数字<=0,则结束)");}System.out.println("程序计算结束");}}
public class MathDemo {public static void main(String area[]){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("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)="+Math.ceil(6.75));System.out.println("floor(6.75)="+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));}}
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