杨辉三角
public class YangHui{ public static void main(String arg[]){ int i=1,j=1,iOf=0; int iN = 20; int[][] arr = new int[iN][iN]; for(i=1;i<iN;i++){ iOf = iN - i - 1; outSpace(iOf); for(j=1;j<=i;j++){ if(i==1||j==1){ arr[i][j] = 1; }else{ arr[i][j] = arr[i-1][j -1] + arr[i-1][j]; } System.out.print(arr[i][j] + " "); } System.out.println(""); } } public static void outSpace(int iNum){ for(int i=1;i<=iNum;i++){ System.out.print(" "); } } }