蓝桥杯 历届试题 PREV-2 打印十字图

 1 import java.io.BufferedReader;
 2 import java.io.IOException;
 3 import java.io.InputStreamReader;
 4 
 5 public class Main {
 6     private static String[][] str; 
 7     public static void main(String[] args) throws IOException{
 8         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 9         int n = Integer.parseInt(br.readLine());
10         
11         print(n);
12         
13     }
14     
15     //打印十字图
16     private static void print(int n) {
17         int row = 9 + 4 * ( n - 1 );                   //计算出行数
18         str = new String[row][row];
19         for(int i = 0; i < row; i++) {                 //先在所有单元格中存入 "."
20             for(int j = 0; j < row; j++) {
21                 str[i][j] = ".";
22             }
23         }
24         
25         int center = row / 2;                           //找出中心
26         for(int i = center - 2; i <= center + 2; i++){  //打印中心十字（图中背景颜色为蓝色）
27             str[center][i] = "$";
28             str[i][center] = "$";
29         }
30         
31         
32         for(int layer = 0; layer < n; layer++) {        //layer：控制打印的圈数
33             //打印四周图形（图中背景颜色为橙色），坐标范围为中心偏左两个单元格开始，中心偏右两个单元格结束，增加一圈即往外增加两个单元格
34             for(int x = (center - 2 - 2*layer); x <= (center + 2 + 2*layer); x++) {
35                 str[center - 4 - 2*layer][x] = "$";
36                 str[x][center - 4 - 2*layer] = "$";
37                 str[center + 4 + 2*layer][x] = "$";
38                 str[x][center + 4 + 2*layer] = "$";
39             }
40             //打印图中背景颜色为绿色和紫色的图形，坐标范围为中心偏左三个单元格开始，中心偏右三个单元格结束，增加一圈即往外增加两个单元格
41             for(int y = center - 3 - 2*layer; y <= center + 3 +2*layer; y++){
42                 str[center - 2 - 2*layer][y] = "$";
43                 str[y][center - 2 - 2*layer] = "$";
44                 str[center + 2 + 2*layer][y] = "$";
45                 str[y][center + 2 + 2*layer] = "$";
46             }
47             //将背景颜色为紫色的单元格变为"."
48             str[center - 2 - 2*layer][center - 1 - 2*layer] = ".";
49             str[center - 1 - 2*layer][center - 2 - 2*layer] = ".";
50             str[center - 2 - 2*layer][center + 1 + 2*layer] = ".";
51             str[center - 1 - 2*layer][center + 2 + 2*layer] = ".";
52             str[center + 2 + 2*layer][center - 1 - 2*layer] = ".";
53             str[center + 1 + 2*layer][center - 2 - 2*layer] = ".";
54             str[center + 2 + 2*layer][center + 1 + 2*layer] = ".";
55             str[center + 1 + 2*layer][center + 2 + 2*layer] = ".";
56         }
57         
58         //输出图形
59         for(int i = 0; i < row; i++) {
60             for(int j = 0; j < row; j++) {
61                 System.out.print(str[i][j]);
62             }
63             System.out.printf("\n");
64         }
65         
66     }
67 }