华工java语言程序设计作业答案1-

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1、华南理工大学学生实验报告书实验名称java课程实验课程名称Java语言程序设计课程号学院软件学院专业软件工程班级学生姓名**学号*******实验地点实验日期第一章1.3publicclassExe1_3{publicstaticvoidmain(String[]args){System.out.println("JAVVA");System.out.println("JAAVVAA");System.out.println("JJAAAAAVVAAAAA");System.out.printl

2、n("JJAAVAA");}}第二章2.21importjava.util.Scanner;publicclassExe2_21{publicstaticvoidmain(String[]args){System.out.println("Enterthreepointsfortriangle:");Scannerinput=newScanner(System.in);doublex1=input.nextDouble();doubley1=input.nextDouble();doublex2

3、=input.nextDouble();doubley2=input.nextDouble();doublex3=input.nextDouble();doubley3=input.nextDouble();doubleside1=Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));doubleside2=Math.sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));doubleside3=Math.sqrt((x2-x3)*(x2-x3

4、)+(y2-y3)*(y2-y3));doubles=(side1+side2+side3)/2;doublearea=Math.sqrt(s*(s-side1)*(s-side2)*(s-side3));System.out.println("Theareaofthetriangleis"+area);}}第三章3.27importjava.util.Scanner;publicclassExe3_27{publicstaticvoidmain(String[]args){finaldoubl

5、ex1=0;finaldoubley1=0;finaldoublex2=200;finaldoubley2=0;finaldoublex3=0;finaldoubley3=100;Scannerinput=newScanner(System.in);System.out.println("Enterapoint'sx-andy-coordinates:");doublex=input.nextDouble();doubley=input.nextDouble();doubley_x=-(x/2)

6、+100;if(xy_x){System.out.println("Thepointisnotinthetriangle!");}else{System.out.println("Thepointisinthetria

7、ngle!");}}}3.29importjava.util.Scanner;publicclassExe3_29{publicstaticvoidmain(String[]args){Scannerinput=newScanner(System.in);System.out.println("Entercircle1'scenterx-,y-coordinatesandradius:");doublex1=input.nextDouble();doubley1=input.nextDouble

8、();doubler1=input.nextDouble();System.out.println("Entercircle2'scenterx-,y-coordinatesandradius:");doublex2=input.nextDouble();doubley2=input.nextDouble();doubler2=input.nextDouble();doublelength=Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));doubleL1=M