for循环实例2

九九乘法表：

 //九九乘法表
            for (int x = 1; x < 10; x++) 
            {
                for (int y = 1; y <=x;y++ )
                {
                    Console.Write(y.ToString()+"*"+x.ToString()+"="+(x*y).ToString()+" "); 
                }
                Console.Write("
"); 
            }
            Console.ReadLine();

被七整除：

         int i = 0;
            Console.Write("请输入一个数");
            int n = Convert.ToInt32(Console.ReadLine());
            for (int num = 7; num < n; num++)
            {
                if (num % 7 == 0)
                {
                    Console.Write(num.ToString() + " ");
                    i++;
                }
            }
            Console.Write("
");
            Console.Write("以上为"+n+"以内被7整除的数" + "
" + "个数：" + i.ToString());
            Console.ReadLine();

水仙花数：

            int a, b, c;
            int n = 0;
            for (int num = 100; num < 1000;num++ )
            {
                a = Convert.ToInt16(num/100);
                b = Convert.ToInt16(num/10-a*10);
                c = Convert.ToInt16(num-(a*100+b*10));
                if (n == a * a * a + b * b * b + c * c * c)
                {
                    Console.Write(num.ToString() + " ");
                    n++;
                }
            }
            Console.WriteLine();
            Console.Write("水仙花数的个数为" + n.ToString());
            Console.ReadLine();