java递归打印九九乘法表

import java.io.*;

/**
* @author 张云涛
* @description 打印9*9乘法表
*
*/
public class Tabale99 {
/**
* @param args
* @return void
*
*/
public static void main(String args[])
{
/***************************************************************/
//用for循环打印9*9乘法表
System.out.println("=========9*9乘法表(for循环打印)==========");
for(int i=1;i<10;i++)
{
for(int j=1;j<=i;j++)
{
System.out.print(j+" * "+i+" = "+j*i); //打印
System.out.print("\t"); //空格
}
System.out.println();
}
/*************************************************************/
//用递归打印9*9乘法表
System.out.println("=========9*9乘法表(递归打印)==========");
method(9);
}

//递归方法
public static void method(int i)
{
if (i == 1)
{
System.out.print("1 * 1 = 1\t\n");
}else
{
method(i - 1);
for (int j = 1; j <= i; j++)
{
System.out.print(j + " * " + i + " = " + j * i + "\t");
}
System.out.println();
}
}

}





/*********************************************************/
//以下是运行的结果
/**
=========9*9乘法表(for循环打印)==========
1 * 1 = 1
1 * 2 = 2 2 * 2 = 4
1 * 3 = 3 2 * 3 = 6 3 * 3 = 9
1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16
1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25
1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36
1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49
1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64
1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81
=========9*9乘法表(递归打印)==========
1 * 1 = 1
1 * 2 = 2 2 * 2 = 4
1 * 3 = 3 2 * 3 = 6 3 * 3 = 9
1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16
1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25
1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36
1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49
1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64
1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81

递归做为一种算法在程序设计语言中广泛应用。是指函数/过程/子程序在运行过程中直接或间接调用自身而产生的重入现象。
递归是计算机科学的一个重要概念，递归的方法是程序设计中有效的方法，采用递归编写程序能使程序变得简洁和清晰。。

递归算法解题相对常用的算法如普通循环等，运行效率较低。因此，应该尽量避免使用递归，除非没有更好的算法或者某种
特定情况，递归更为适合的时候。在递归调用的过程当中系统为每一层的返回点、局部量等开辟了栈来存储。递归次数过多容易造成栈溢

出等。















*/