package traning.multiplicative;

/**
 * 
 * @author cloud
 *
 */

public class MultiplicativeTable {

	/**
	 * 九九乘法表
	 */
	public static void printMultiplicativeTable(){
		for (int i = 1; i < 10; i++) {
			for (int j = 1; j <= i; j++) {
				System.out.print(i + " * " + j + " = " + (i * j) + "\t");
			}
			System.out.println();
		}
	}
	
	/**
	 * 列印楊輝三角形
	 */
	public static void printTrigon(){
	    int[][] a = new int[10][10];
	    for(int i = 0; i < 10; i++) {
	    	a[i][i] = 1;
	    	a[i][0] = 1;
	    }
	    for(int i=2; 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 k=0; k<2*(10-i)-1; k++) {
	    		System.out.print(" ");
	    }
	    for(int j=0; j<=i; j++) {
	    	System.out.print(a[i][j] + "   ");
	    }
	    System.out.println();
	   }
	}
	
	public static void main(String[] args) {
		printTrigon();
	}
}