2018-11-21(for语句)

       Console.WriteLine("请输入一个数字");
        int c = Convert.ToInt32(Console.ReadLine());
        int i = 0;
        for (i = 0; i < c; i++)
        
        
        
        {
            Console.WriteLine("{0}+{1}={2}", i, c-i, c);
        }

        Console.ReadKey();