Java编程实现帕斯卡三角形代码示例

package com.work;  
 
public class YangHuiSanJiao  
{  
    public static void main(String[] args) {  
    int [][]a = new int [10][10];  
      for(int n = 0; n < 10;n++)  
      {  
       a[n][0] = 1;  
       a[n][n] = 1;  
      }  
      for(int n = 2; n <10; n++)  
      {  
      for(int j = 1; j < n; j++)  
      {  
       a[n][j] = a[n -1][j -1] + a[n - 1][j];  
      }  
      }  
 
      for(int n = 0; n < 10; n++)  
      {  
      for(int k = 0; k < 2 * (10 - n) - 1; k++)  
      {  
       System.out.print(" ");  
      }  
      for(int j = 0; j <= n; j++)  
      {  
       System. out.print(a[n][j] + "  ");  
      }  
      System.out.println();  
      }  
 
 }  
} 

package com.face; 
 
import java.util.Scanner; 
 
public class YangHui { 
  public static void main(String[] args) { 
    printYFTriangle(); 
  } 
  <pre code_snippet_id="2474965" snippet_file_name="blog_20170708_2_9005712" class="prettyprint" name="code"><code class="hljs java has-numbering"><span class="hljs-javadoc">/** 
   * 1 要理解下面的实现，首先要明白int数组中元素默认值为 0 
   * 2 然后每一次迭代打印新的一行的元素的时候： 
   * 新的特定位置的元素 = 该位置原来的元素 + 该位置的前一个位置的值 
   */</span></code></pre>public static void printYFTriangle(){    System.out.println("杨辉三角，您准备输出的行数:");    Scanner input = new Scanner(System.in);    int lines = input.nextInt();//获得循环的行数；    int[] a = new int[lines + 1];//临时存储数据用；    int previous = 1; //默认第一个数；    for (int i = 1; i <= lines; i ++){//i 用来控制行数;      for(int j=1;j<=lines-i;j++){//输出空格，很easy;        System.out.print(" ");     }      for (int j = 1; j <= i; j++){        int current = a[j];//先获得后一个数，        a[j] = previous + current;        previous = current;        System.out.print(a[j] + " ");      }      System.out.println();    }}} 

package com.face; 
 
import java.util.Scanner; 
 
public class DiGui { 
  static int fun(int n,int k){ 
    //n,行，k:列 
    if(k==1||n==k) 
      return 1; 
    else 
      return fun(n-1,k-1)+fun(n-1,k); 
  } 
  public static void main(String[] args) { 
    int lines; 
    System.out.println("请输入行数："); 
    Scanner input=new Scanner(System.in); 
    lines=input.nextInt(); 
    for(int i=1;i<=lines;i++){ 
      for(int k=1;k<lines-i+1;k++){ 
        System.out.print(" "); 
      } 
      for(int j=1;j<=i;j++){ 
        System.out.print(fun(i,j)+" "); 
      } 
      System.out.println(); 
    } 
  } 
} 

/**
 * 打印杨辉三角形（帕斯卡三角形），打印10行
 *
 */
public class Yanghuisanjiao {
 
  public static void main(String[] args) {
    int [][] a = new int[11][11];
    for (int i = 0 ; i < 10 ; i++) {
      a[i][0] = 1;
      a[i][i] = 1;
    }
     
    for (int i = 1 ; i < 10 ; i ++) {
      for (int j = 1; j < i ; j++) {
        a[i][j] = a[i-1][j-1] + a[i-1][j];
      }
    }
    for (int i = 0; i < 10 ; i++) {
      for (int j = 0; j < 10-i;j++) {
        System.out.print(" ");
      }
      for (int k = 0; k < 10;k++) {
        if (a[i][k] != 0) {
          System.out.print(a[i][k]+" ");
        }
         
      }
      System.out.println();
    }
  }
 
}