雷潮教育第一期班C#课程阶段总结(第二周)

2020-06-02 15:50:34 浏览数 (1)

流程控制练习:
代码语言:javascript复制
//  1-两数的加减乘除
            Console.WriteLine("请输入两个整数并回车:");
            int i1 = Convert.ToInt32(Console.ReadLine());
            int i2 = Convert.ToInt32(Console.ReadLine());
            int jia, jian, cheng;
            float chu;
            Console.WriteLine("请输入运算:0-加法,1-减法,2-乘法,3-除法");
            int y = Convert.ToInt32(Console.ReadLine());
            switch (y)
            {
                case 0:
                    jia = i1   i2;
                    Console.WriteLine("两数相加得数是:"   jia);
                    break;
                case 1:
                    jian = i1 - i2;
                    Console.WriteLine("两数相减得数是:"   jian);
                    break;
                case 2:
                    cheng = i1 * i2;
                    Console.WriteLine("两数相乘得数是:"   cheng);
                    break;
                case 3:
                    chu = (float)i1 / i2;
                    Console.WriteLine("两数相除得数是:"   chu.ToString("#0.00"));
                    break;
                default:
                    Console.WriteLine("输入有误!");
                    break;

            }
         
2-求出1~1000之间的所有能被7整除的数,并计算和输出每5个的和。 
int sum = 0, count=0;
             
            for (int i = 1; i < 1000; i  )
            {
                if (i % 7 == 0)
                {
                    sum  = i;
                    count  ;
                    Console.WriteLine(i);
                }
                if(count==5)
                {
                    Console.WriteLine("这5个数的和是:" sum);
                    sum = 0;
                    count = 0;                 
                   
                }
            }
3-分别输出1~100之间的平方、平方根。 
int pf = 1;
            double pfg;
            Console.WriteLine("100以内的数的平方:");
            for (int i = 1; i <= 100; i  )
            {
                pf = i * i;
                Console.WriteLine(pf);
            }
            Console.WriteLine("100以内的数的平方根:");
            for (int j = 1; j <=100; j  )
            {
                pfg = Math.Sqrt(j);
                Console.WriteLine(pfg);
            }
                 
            Console.WriteLine(d);
4-100中能被3整除但不能被5整除的数,并统计有多少个这样的数。
 int count = 0;
            for (int i = 0; i <= 100; i  )
            {
                if(i%3==0 && i%5!=0)
                {
                    Console.WriteLine(i);
                    count  ;
                }
            }
            Console.WriteLine("100以内能被3整除不能被5整除的数及个数:" count);
5-九九乘法表
            int j = 1;
            for (int r = 1; r <= 9; r  )
            {
                for (int c = 1; c < 10; c  )
                {
                    if(r>=c)
                    Console.Write("{0}*{1}={2}t", c, r, r * c);                    
                }
                Console.WriteLine();
            }    

6- 要求用户输入5个大写字母,如果用户输入的信息不满足要求,提示帮助信息并要求重新输入。
            // 1.获取用户输入

            Console.WriteLine("请输入5个大写字母:");

            string strs = Console.ReadLine();

            for (int i = 0; i < strs.Length; i  )
            {
                if (strs[i] >= 'A' && strs[i] <= 'Z')
                {
                    Console.WriteLine("输入的是大写");
                }
                foreach (char cha in strs)
                {
                    if (cha <= 122 && cha >= 97)
                    {
                        Console.WriteLine("输入准确");
                    }
                }
                Console.WriteLine(strs[i]);
            }      
7-四个数比较取最大最小值
  //Console.WriteLine("请输入四个数:");
            //int n1 = Convert.ToInt32(Console.ReadLine());
            //int n2 = Convert.ToInt32(Console.ReadLine());
            //int n3 = Convert.ToInt32(Console.ReadLine());
            //int n4 = Convert.ToInt32(Console.ReadLine());
            // int[] numbers = { 6, 5, 19, 14 }; // 0 ,1,2,3
            int max = 0;
            int min = 0;

            /*
            Array.Sort(numbers);
            for (int i = 0; i < numbers.Length; i  )
            {
                Console.WriteLine(numbers[i]);
            }
            min = numbers[0];
            max = numbers[3];
            Console.WriteLine(max min);
            */
            /*
            //max  = (n1 > n2 ? n1 : n2) > (n3 > n4 ? n3 : n4) ? (n1 > n2 ? n1 : n2) : (n3 > n4 ? n3 : n4);
            //min = (n1 < n2 ? n1 : n2) < (n3 < n4 ? n3 : n4) ? (n1 < n2 ? n1 : n2) : (n3 < n4 ? n3 : n4);

            //Console.WriteLine(max);
            //Console.WriteLine(min);
            */
            /*
            for (int i = 1; i < numbers.Length;   i)
            {
                // 定义一个变量来接受numbers[1]
                int t = numbers[i];
                // 用j记录索引
                int j = i;   // 第一次: 1
                //  j>0 && numbers[0] > numbers[1]
                // 递减排序,每一次都是后一位比前一位,拿到最大值
                while ((j > 0) && (numbers[j - 1] > t))
                {
                    // numbers[1] = numbers[0]
                    numbers[j] = numbers[j - 1];
                    --j;// 先减
                }
                
                numbers[j] = t;       
            }
            */
            /*
            int[] numbers = { 6, 5, 19, 14 };
            //  i < 3
            for (int i = 0; i < numbers.Length - 1; i  )
            {
                Console.WriteLine(numbers[i]);
                // # region将大的数字移到数组的arr.Length-1-i
                for (int j = 0; j < numbers.Length - 1 - i; j  )
                {
                    if (numbers[j] > numbers[j   1])
                    {
                        max = numbers[j   1];
                        numbers[j   1] = numbers[j];
                        numbers[j] = max;
                    }
                }
            }
            */
            /*
            int[] numbers = { 6, 5, 19, 14 };
            //  i < 3
            for (int i = 3; i >= 0; i--)
            {
                Console.WriteLine(numbers[i]);
                // # region将大的数字移到数组的arr.Length-1-i
                for (int j = 0; j < numbers.Length - 1 - i; j  )
                {
                    if (numbers[j] > numbers[j   1])
                    {
                        max = numbers[j   1];
                        numbers[j   1] = numbers[j];
                        numbers[j] = max;
                    }
                }
            }
            */ 
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