华工Java语言程序设计作业答案1-.doc

《华工Java语言程序设计作业答案1-.doc》由会员分享，可在线阅读，更多相关《华工Java语言程序设计作业答案1-.doc（14页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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1.3public class Exe1_3 public static void main(String args) System.out.println( J A V V A); System.out.println( J A A V V A A); System.out.println(J J AAAAA V V AAAAA); System.out.println( J J A A V A A); 第二章2.21import java.u

2、til.Scanner;public class Exe2_21 public static void main(String args) System.out.println(Enter three points for triangle : ); Scanner input = new Scanner(System.in); double x1 = input.nextDouble(); double y1 = input.nextDouble(); double x2 = input.nextDouble(); double y2 = input.nextDouble(); double

3、 x3 = input.nextDouble(); double y3 = input.nextDouble(); double side1 = Math.sqrt( (x1-x2)*(x1-x2) + (y1-y2)*(y1-y2) ); double side2 = Math.sqrt( (x1-x3)*(x1-x3) + (y1-y3)*(y1-y3) ); double side3 = Math.sqrt( (x2-x3)*(x2-x3) + (y2-y3)*(y2-y3) ); double s = (side1 + side2 + side3) / 2; double area =

4、 Math.sqrt( s * (s-side1) * (s-side2) * (s-side3) ); System.out.println(The area of the triangle is + area); 第三章3.27import java.util.Scanner;public class Exe3_27 public static void main(String args)final double x1 = 0;final double y1 = 0;final double x2 = 200;final double y2 = 0;final double x3 = 0;

5、final double y3 = 100;Scanner input = new Scanner(System.in);System.out.println(Enter a points x- and y-coordinates : );double x = input.nextDouble();double y = input.nextDouble();double y_x = -(x/2) + 100;if( xx1 & xx3 )System.out.println(The point is not in the triangle!);else if( yy1 & yy_x )Syst

6、em.out.println(The point is not in the triangle!);elseSystem.out.println(The point is in the triangle!); 3.29import java.util.Scanner;public class Exe3_29 public static void main(String args)Scanner input = new Scanner(System.in);System.out.println(Enter circle1s center x- ,y-coordinates and radius

7、: );double x1 = input.nextDouble();double y1 = input.nextDouble();double r1 = input.nextDouble();System.out.println(Enter circle2s center x- ,y-coordinates and radius : );double x2 = input.nextDouble();double y2 = input.nextDouble();double r2 = input.nextDouble();double length = Math.sqrt( (x1-x2)*(

8、x1-x2) + (y1-y2)*(y1-y2) );double L1 = Math.abs( r1 - r2 );double L2 = r1 + r2;if(length = L1)System.out.println(circle2 is in circle1!);else if(length = L2)System.out.println(circle2 overlaps circle1!);elseSystem.out.println(circle2 does not overlap circle1);第四章4.25public class Exe4_25 public stati

9、c void main(String args)double PI = 0,sum = 0;int i, n;for( i = 10000; i = 100000; i += 10000 )for( n = 1; n max)max = integer;count = 1;else if(integer max)elsecount+=1;System.out.println(The largest number is + max);System.out.println(The occurence count of the largest number is + count);第五章5.21im

10、port java.util.Scanner;public class Exe5_21 public static void main(String args)Scanner input = new Scanner(System.in);double ary = new double10;System.out.println(Enter ten numbers : );for (int i = 0; i ary.length; i+ )aryi = input.nextDouble();double sum = 0, sum_pow = 0;for (int i = 0; i ary.leng

11、th; i+)sum += aryi;for (int i = 0; i ary.length; i+)sum_pow += aryi*aryi;double mean = sum/ary.length;double standard_value = Math.sqrt(sum_pow - sum*sum/ary.length) / (ary.length - 1.0) );System.out.println(The mean is + mean);System.out.println(The standard deviation is + standard_value);第六章6.18im

12、port java.util.Scanner;public class Exe6_18 public static void main (String args) System.out.print(Enter ten real number : ); double array = new double10; Input(array); Sort(array); Output(array); /输入 public static void Input(doubleary) Scanner input = new Scanner(System.in); for(int i = 0; i ary.le

13、ngth; i+) aryi = input.nextDouble(); /输出 public static void Output(doubleary) for(int i = 0; i ary.length; i+) System.out.print( + aryi); /冒泡排序 public static void Sort(doubleary) int n = 0;boolean work = true; double temp = 0; for(int i = 1; i ary.length; i+) work = true; for( n = 0; n aryn+1) temp

14、= aryn; aryn = aryn+1; aryn+1 = temp; work = false; if(work) break; 第七章7.6import java.util.Scanner;public class Exe7_6 final static int R = 3;final static int L = 3; public static void main(Stringargs) double matrix1 = new doubleLR; double matrix2 = new doubleLR; System.out.println(Enter matrix1 : )

15、; Input(matrix1); System.out.println(Enter matrix2 : ); Input(matrix2); Output(matrix1,matrix2,multiplyMatrix(matrix1,matrix2); /输入 public static void Input(doublematrix) Scanner input = new Scanner(System.in); for(int line = 0; line L; line+) for(int row = 0; row R; row+) matrixlinerow = input.next

16、Double(); /输出 public static void Output(double a, double b,doublematrix) int n = 0; for(int i = 0; i L; i+ ) if( i != 1) for( n = 0; n R; n+) System.out.print( + ain); System.out.print( ); for( n = 0; n R; n+) System.out.print( + bin); System.out.print( ); for( n = 0; n R; n+) System.out.print( + ma

17、trixin); else for( n = 0; n R; n+) System.out.print( + ain); System.out.print( *); for( n = 0; n R; n+) System.out.print( + bin); System.out.print( =); for( n = 0; n R; n+) System.out.print( + matrixin); System.out.println(); /矩阵相乘 public static double multiplyMatrix(double a, double b) double c = n

18、ew doubleLR; for(int i = 0; i L; i+) for(int j = 0; j R; j+) cij = 0; for(int k = 0; k R; k+) cij += aik*bkj; /cij = ai0*b0j + ai1*b1j + ai2*b2j; return c; 第八章8.12import java.util.Scanner;public class Exe8_12public static void main(String args)Scanner input = new Scanner(System.in);System.out.print(

19、Enter the endpoints of the first line segment : ); double x1=input.nextDouble(); double y1=input.nextDouble(); double x2=input.nextDouble(); double y2=input.nextDouble(); System.out.print(Enter the endpoints of the second line segment : ); double x3=input.nextDouble(); double y3=input.nextDouble();

20、double x4=input.nextDouble(); double y4=input.nextDouble(); double a,b,c,d,e,f; a=y2-y1; b=x1-x2; c=y4-y3; d=x3-x4; e=(y2-y1)*x1+(x1-x2)*y1; f=(y4-y3)*x3+(x3-x4)*y3; LinearEquation inter=new LinearEquation(a,b,c,d,e,f); if(inter.isSolvable() System.out.print(The intersecting point is:+inter.getX()+,

21、+inter.getY(); else System.out.print(NULL); class LinearEquationprivate double a;private double b;private double c;private double d;private double e;private double f;public LinearEquation(double a,double b,double c,double d,double e,double f)this.a = a;this.b = b;this.c = c;this.d = d;this.e = e;thi

22、s.f = f;boolean isSolvable()if (a * d - b * c != 0)return true;elsereturn false;double getX() return (e * d - b * f) / (a * d - b * c); double getY() return (a * f - e * c) / (a * d - b * c); 8.13import java.util.Scanner;public class Exe8_13 public static void main(String args) Scanner input = new S

23、canner(System.in); System.out.println(Enter the number of rows and columns of the array : ); int row = input.nextInt(); int column = input.nextInt(); double array = new doublerowcolumn; System.out.println(Enter the array : ); for(int i = 0; i row; i+) for(int n = 0; n column; n+) arrayin = input.nex

24、tDouble(); System.out.println(The location of the largest element is + locateLargest(array).maxValue + at ( + locateLargest(array).row + , + locateLargest(array).column + ); public static Location locateLargest(double a)double maxNumber=a00;int row=0,column=0;for(int i=0;ia.length;i+)for(int j=0;jmaxNumber)maxNumber=aij;row=i;column=j;return new Location(row,column,maxNumber);class LocationLocation(int row,int column,double maxValue)this.row=row;this.column=column;this.maxValue=maxValue;public int row,column;public double maxValue;