杨辉三角

public class Yanghui {
public static void main(String args[]){
int n=10;
int a[][]=new int[n][];
int i,j;
for(i=0;i<n;i++){
a[i]=new int[i+1];
a[i][0]=1;
a[i][i]=1;
for(j=1;j<i;j++)
a[i][j]=a[i-1][j-1]+a[i-1][j];
}
for(i=0;i<a.length;i++){
for(j=0;j<n-1;j++)
System.out.print(" ");
for(j=0;j<a[i].length;j++)
System.out.print(" "+a[i][j]);
System.out.println();
}

}

}