杨辉三角

/**
 * 杨辉三角
 * @author chunzai
 *
 */
public class Test1 {
    public static void main(String[] args) {
        int a[][] = new int[7][];
        for(int i=0;i<7;i++){
            a[i] = new int[i+1];
            for(int j=i;j<6;j++){
                System.out.print(" ");
            }
            for(int k=0;k<=i;k++){
                
                if(k==0||k==i){
                    a[i][k] = 1;
                    
                }else{
                    a[i][k] = a[i-1][k]+a[i-1][k-1];
                    
                }
                System.out.print(a[i][k]+" ");
            }
            System.out.println();
        }
    }
}