实验3 方法和数组(5)

public class LX3_18 { public static void main(String[] args) { System.out.println(\); System.out.println(\ + add(creatArrays())); } public static int[][] creatArrays() { int[][] array1 = new int[4][4]; Scanner input = new Scanner(System.in); for (int i = 0; i < 4; i++) { for (int j = 0; j < 4; j++) { array1[i][j] = input.nextInt(); } } return array1; } public static int add(int[][] list) { int sum = 0; for (int i = 0; i < 4; i++) { for (int j = 0; j < 4; j++) { if (i == j) { sum = sum + list[i][j]; } } } return sum; } } 运行结果贴图：

7.6 程序代码：import java.util.Scanner; public class LX3_19 { /** * @param args */ public static void main(String[] args) { System.out.print(\); double[][] array1 = creatArrays(); System.out.print(\); double[][] array2 = creatArrays(); double[][] array3 = Cheng(array1, array2); System.out.println(\); sysOut(array1, array2, array3); } // TODO 自动生成的方法存根

public static void sysOut(double[][] m1, double[][] m2, double[][] m3) { for (int i = 0; i < m1.length; i++) { for (int j = 0; j < m1[i].length; j++) System.out.printf(\, m1[i][j]); if (i == m1.length / 2) System.out.print(\ + \ + \); else System.out.print(\); for (int j = 0; j < m2[i].length; j++) System.out.printf(\, m2[i][j]); if (i == m1.length / 2) System.out.print(\); else System.out.print(\); for (int j = 0; j < m3[i].length; j++) System.out.printf(\, m3[i][j]); System.out.println(); } } public static double[][] creatArrays() { double[][] array1 = new double[3][3]; Scanner input = new Scanner(System.in); for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) { array1[i][j] = input.nextDouble(); } } return array1; } public static double[][] Cheng(double[][] cheng1, double[][] cheng2) { double[][] Answer = new double[3][3]; for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) { Answer[i][j] = cheng1[i][0] * cheng2[0][j] + cheng1[i][1] * cheng2[1][j] + cheng1[i][2] * cheng2[2][j]; }

} return Answer; } } 运行结果贴图： 7.23 程序代码： import java.util.*; public class LX3_20 { } public static void main(String[] args) { double[][] arrayText = creatArrays(); double su = 1 / count1(arrayText); double[][] arrayText2 = array2(arrayText); double[][] arrayText3 = array3Count(arrayText2, su); print(arrayText3);

public static double[][] array3Count(double[][] list3, double su1) { double[][] arry3 = new double[3][3]; for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) { } arry3[i][j] = su1 * list3[i][j]; public static double[][] array2(double[][] list2) { } double[][] arry2 = new double[3][3]; arry2[0][0] = list2[1][1] * list2[2][2] - list2[1][2] * list2[2][1]; arry2[0][1] = list2[0][2] * list2[2][1] - list2[0][1] * list2[2][2]; arry2[0][2] = list2[0][1] * list2[1][2] - list2[0][2] * list2[1][1]; arry2[1][0] = list2[1][2] * list2[2][0] - list2[1][0] * list2[2][2]; arry2[1][1] = list2[0][0] * list2[2][2] - list2[0][2] * list2[2][0]; arry2[1][2] = list2[0][2] * list2[1][0] - list2[0][0] * list2[1][2]; arry2[2][0] = list2[1][0] * list2[2][1] - list2[1][1] * list2[2][0]; arry2[2][1] = list2[0][1] * list2[2][0] - list2[0][0] * list2[2][1]; arry2[2][2] = list2[0][0] * list2[1][1] - list2[0][1] * list2[1][0]; return arry2; public static double count1(double[][] list) { } double sum = 0; sum = list[0][0] * list[1][1] * list[2][2] + list[2][0] * list[0][1] * list[1][2] + list[0][2] * list[1][0] * list[2][1] - list[0][2] * list[1][1] * list[2][0] - list[0][0] * list[1][2] * list[2][1] - list[2][2] * list[1][0] * list[0][1]; public static double[][] creatArrays() { } System.out.println(\); double[][] array = new double[3][3]; Scanner input = new Scanner(System.in); for (int i = 0; i < 3; i++) { } return array; for (int j = 0; j < 3; j++) { } array[i][j] = input.nextDouble(); // sum=Math.abs(sum) ; return sum;

} } } return arry3; public static void print(double[][] list4) { } for (int i = 0; i < 3; i++) { } for (int j = 0; j < 3; j++) { } System.out.println(); System.out.printf(\, list4[i][j]); 运行结果贴图：

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