試圖使用while循環來保持循環，直到用戶放入n（Java）

Question

我試圖使用while循環來繼續詢問用戶他們是否想要pascal三角形的某一行。我不知道把我的while循環放在哪裏。

我想問另一個（y/n）？如果用戶輸入y，我會問哪個pascal三角形的行號？

整個事情再次發生。

import java.util.Arrays; 
import java.util.Scanner; 

public class PascalTriangle 
{ 
    public static void main(String[] args) 
    { 
    Scanner scanner = new Scanner(System.in); 
    System.out.print("Which line number of pascal's triangle ? "); 
    int rowToCompute = scanner.nextInt(); 
    System.out.println("Line " + rowToCompute + " of Pascal's Triangle is " + Arrays.toString(computeRow(rowToCompute))); 
    System.out.println("Another (y/n)?"); 
    String another = scanner.nextLine(); 

    while(another.equalsIgnoreCase("y")) 
    { 
     System.out.print("Which line number of pascal's triangle ? "); 
    } 
} 

public static int[] computeRow(int rowToCompute) 
{ 
    if(rowToCompute == 1) 
    { 
    int[] arr1 = new int[1];  
     arr1[0] = 1; 
    return arr1; 
    } 

    else 
    { 
    int[] lastRow = computeRow(rowToCompute - 1); 
    int[] thisRow = computeNextRow(lastRow); 

     return thisRow; 
    } 

}//ends computeRow method 

public static int[] computeNextRow(int[] previousRow) 
{ 
    int[] newAr = new int[previousRow.length + 1]; 

    newAr[0] = 1; 
    newAr[previousRow.length] = 1; 

    for(int i = 1; i < previousRow.length; i++) 
    { 
     newAr[i] = previousRow[i-1] + previousRow[i]; 
    } 

     return newAr; 
    }//ends computeNextRow method 

}//end pascal triangle class 

Answer 1

你應該嘗試這樣的事情。

public static void main(String[] args) { 
    Scanner scanner = new Scanner(System.in); 

    while (true) { // infinity loop, because you want ask many times 
     System.out.print("Which line number of pascal's triangle ? "); 
     int rowToCompute = scanner.nextInt(); 
     System.out.println("Line " + rowToCompute + " of Pascal's Triangle is " + Arrays.toString(computeRow(rowToCompute))); 

     System.out.println("Another (y/n)?"); 
     String another = scanner.next(); 

     if (!another.equalsIgnoreCase("y")) { // if answer is other then 'y', break the loop 
      break; 
     } 
    } 
}