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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13.         Scanner scn = new Scanner(System.in);
  14.         int n;
  15.  
  16.         while (true) {
  17.             System.out.println("Enter numbers n: ");
  18.             n = scn.nextInt();
  19.  
  20.             if (n == 0) {
  21.                 break; // 結束程式
  22.             } else if (n < 0) {
  23.                 System.out.println("Invalid input!");
  24.                 continue;
  25.             }
  26.  
  27.             for (int layer = 1; layer <= n; layer++) { // 層數
  28.                 for (int row = 0; row < n; row++) { // 每個三角形的行數
  29.                     for (int tri = 0; tri < layer; tri++) { // 每層有 layer 個三角形
  30.                         for (int col = 0; col <= row; col++) { // 三角形的列
  31.                             System.out.print("*");
  32.                         }
  33.                         System.out.print("   "); // 三角形之間的間距
  34.                     }
  35.                     System.out.println(); // 換行
  36.                 }
  37.             }
  38.         }
  39.         scn.close();
  40. 	}
  41. }
Success #stdin #stdout 0.12s 54572KB
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stdin
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2 3 -2 0
stdout
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Enter numbers n: 
*   
**   
*   *   
**   **   
Enter numbers n: 
*   
**   
***   
*   *   
**   **   
***   ***   
*   *   *   
**   **   **   
***   ***   ***   
Enter numbers n: 
Invalid input!
Enter numbers n:
https://ideone.com/jqAUl2
language:
Java (HotSpot 12)
created:
9 days ago
visibility:
public

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