数组、二维数组

                                                     简单的数组、二位数组 1 package com.lovo;
 2
 3 import java.util.Scanner;
 4
 5 /**
 6  * 二维数组
 7  *
 8  * @author 王启文
 9  *
10  */
11
12 public class D2 {
13     public static void main(String[] args) {
14         Scanner sc = new Scanner(System.in);
15
16         String[] names = { "赵大", "钱二", "孙三", "李四", "周五" };
17         String[] course = { "语文", "数学", "英语" };
18         double[][] scores = new double[5][3];
19
20         for (int i = 0; i < scores.length; ++i) {
21             System.out.println("请输入" + names[i] + "的成绩：");
22             for (int j = 0; j < scores[i].length; ++j) {
23                 System.out.print("\t" + course[j] + ":");
24                 scores[i][j] = sc.nextDouble();
25             }
26         }
27
28         double ChSum = 0;
29         double MaSum = 0;
30         double EnSum = 0;
31
32         for (int i = 0; i < scores.length; ++i) {
33             double sum = 0;
34             for (int j = 0; j < scores[i].length; ++j) {
35                 sum += scores[i][j];
36                 if (j == 0) {
37                     ChSum += scores[i][j];
38                 }
39                 if (j == 1) {
40                     MaSum += scores[i][j];
41                 }
42                 if (j == 2) {
43                     EnSum += scores[i][j];
44                 }
45             }
46             System.out.printf("%s的平均分为：%.2f\n", names[i], sum
47                     / scores[i].length);
48         }
49
50         System.out.printf("语文的平均分为：%.2f\n", ChSum / names.length);
51         System.out.printf("数学的平均分为：%.2f\n", MaSum / names.length);
52         System.out.printf("英语的平均分为：%.2f\n", EnSum / names.length);
53
54         sc.close();
55     }
56 }

杨辉三角

 1 package com.lovo;
 2
 3 /**
 4  * 杨辉三角
 5  *
 6  * @author 王启文
 7  *
 8  */
 9 public class D3 {
10     public static void main(String[] args) {
11         int[][] h = new int[10][];
12
13         for (int i = 0; i < h.length; ++i) {
14             h[i] = new int[i + 1];
15             for (int j = 0; j < h[i].length; ++j) {
16                 if (j == 0 || j == i) {
17                     h[i][j] = 0;
18                 } else {
19                     h[i][j] = h[i - 1][j] + h[i - 1][j - 1];
20                 }
21                 System.out.print(h[i][j] + "\t");
22             }
23             System.out.println();
24         }
25     }
26 }