C#初级练习题（1）

1.找出100到999之间的水仙花数；153 = 1*1*1 + 5*5*5 + 3*3*3；

2. 3个可乐瓶可以换一瓶可乐，现在有364瓶可乐。

问一共可以喝多少瓶可乐，剩下几个空瓶！

3.猜数字游戏，我有一个数，请您猜猜是多少？

//请输入一个0-50之间的数：20；

//这个数比20大：30

//这个数比30小：25

//你猜对了

4.用户输入一组数字，对用户输入的数字从小到大输出（arroy.sort或者冒泡排序或插入排序）

答案：

1.

            int num = 0;
            int temp = 0;
            int[] n = { 0, 0, 0 };
            for (int i = 100; i <= 999; i++)
            {
                n[0] = i/100;
                n[1] = (i / 10) % 10;
                n[2] = i % 10;
                temp = n[0] * n[0] * n[0] + n[1] * n[1] * n[1] + n[2] * n[2] * n[2];
                if(temp == i)
                {
                    Console.WriteLine(temp);
                }
            }

2.

            int sum = 364;//瓶子总个数
            int remainEmpty = sum;//空瓶子个数
            while (remainEmpty >= 3)
            {
                int n=0;
                int m=0;
                sum += remainEmpty/3;
                n = remainEmpty / 3;
                m = remainEmpty % 3;
                remainEmpty = n + m;
                
            }
            Console.WriteLine(sum);
            Console.WriteLine(remainEmpty);
            Console.ReadKey();

3.

            Random random = new Random();
            int number = random.Next(0, 50);
            Console.WriteLine("guess a number(0-50):");
            while (true)
            {
                int temp = Convert.ToInt32(Console.ReadLine());
                if(temp == number)
                {
                    Console.WriteLine("you are right");
                }
                else if (temp < number)
                {
                    Console.WriteLine("number is litter");
                }
                else if (temp > number)
                {
                    Console.WriteLine("number is bigger");
                }
            }

4.

            string str = Console.ReadLine();
            string[] strArray = str.Split(' ');
            int[] numArray = new int[strArray.Length];
            int count = strArray.Length;
            for (int i = 0; i < count; i++)
            {
                numArray[i] = Convert.ToInt32(strArray[i]);
            }
                for (int i = 0; i < count; i++)
            {
                
                int temp = numArray[i];

                for(int j = i+1; j < count; j++)
                {
                    if (numArray[j] < temp)
                    {
                        temp = numArray[j];
                        numArray[j] = numArray[i];
                        numArray[i] = temp;
                    }
                }
                Console.WriteLine(numArray[i]);
            }
            Console.ReadKey();