.Net基础篇_学习笔记_第六天_for循环的嵌套_乘法口诀表

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 第六天_for循环的嵌套
{
    class Program
    {
        static void Main(string[] args)
        {
            int num01;
            int num02;
            for (num01 = 1; num01 <= 9; num01++)
            {
                for (num02=1; num02 <= num01; num02++)
                {
         
                    Console.Write("{0}*{1}={2}	", num01, num02, num01 * num02);
                    if (num01 <= num02)
                    { 
                        Console.Write("
");
                    }
                }


            }
            Console.ReadKey();
        }
    }
}

当某个事情要做一边，另外一个事情要做N遍的时候，需要用到for循环的嵌套。

优化为：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 第六天_for循环的嵌套
{
    class Program
    {
        static void Main(string[] args)
        {
            int num01;
            int num02;
            for (num01 = 1; num01 <= 9; num01++)
            {
                for (num02=1; num02 <= num01; num02++)
                {
                    Console.Write("{0}*{1}={2}	", num01, num02, num01 * num02);    
                }
                Console.WriteLine();                                                     //Console.Write("
");
            }
            Console.ReadKey();
        }
    }
}

引申：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 第六天_for循环的嵌套
{
    class Program
    {
        static void Main(string[] args)
        {
            int num01;
            int num02;
            for (num01 = 1; num01 <= 9; num01++)
            {
                for (num02=1; num02 <= num01; num02++)
                {
         
                    Console.Write("{0}*{1}={2}	", num01, num02, num01 * num02);
                  
                    if (num01 <= num02)
                    { 
                        Console.Write("
");
                        break;                                                          //此处的break不起作用，在上面的for循环中起作用？为什么？
                    }
                
                }


            }
            Console.ReadKey();
        }
    }
}

 附带：

加法表

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 第六天_do_while循环
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入一个数字：");
            int num00=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("您得到的加法表为：");
            for (int i = 0; i<= num00; i++)
            {

                    Console.WriteLine("{0}+{1}={2}", i, num00-i, num00);
               
            }
            Console.ReadKey();

        }
    }
}