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初學Java,列印楊輝三角形

import java.util.Scanner;
class Test4{
  public static void main(String[] args){
    Scanner input = new Scanner(System.in);
    System.out.println("請輸入楊輝三角形的行數:");
    int line = input.nextInt();
    for(int i = 1; i<=line; i++){
      for(int j=line-i; j>0; j--){
      System.out.print(" ");
      }
      for(int k=1; k<=i; k++){
        long n=getNum(i-1), r=getNum(k-1), m=getNum(i-k);
        System.out.print(" "+(n/r/m));
      }
      System.out.println();
    }
  }
  public static long getNum(long num){
    if(num==0||num==1){
      return 1;
    }else{
      return num*getNum(num-1);
    }
  }
}