C#基础-056 字符串练习题

    static void Main(string[] args)
        {
///*1.去掉字符串中的所有空格*/
//string str = " saggasg sagsgssa gaseg ";
//Console.WriteLine(MainClass.Task01(str));

///*2.根据完整的路径从路径中分离文件路径、文件名及扩展名*/
//string pa = @"c:\1\2\3\hello world.txt";
//Console.WriteLine("文件名:{0}", Path.GetFileName(pa));
//Console.WriteLine("扩展名:{0}",Path.GetExtension(pa));
//Console.ReadKey();

///*3.获取字符串中汉字的个数*/
//str = "asbbf 阿斯蒂芬笔记本sdggas466";
//Console.WriteLine(MainClass.Task03(str));
//Console.ReadKey();

///*4.对字符串进行加密与解密*/
//string userName = "452dfg比暗勃515较8";
//Console.WriteLine(MainClass.Task04(userName, 20));
//Console.ReadLine();
//Console.WriteLine(MainClass.Task04_01(MainClass.Task04(userName, 20), 20));
//Console.ReadKey();

///*5.将字母全部转换为大写或小写*/
//string testStr = "bnsdfBKSA6546as东方不败";
//Console.WriteLine(MainClass.Task05_MyToLower(testStr));
//Console.WriteLine(MainClass.Task05_MyToUpper(testStr));
//Console.ReadKey();

///*6.根据标点符号对字符串进行分行*/
//str = "按时间，暗示法 、大师傅，第三。但是发";
//str = MainClass.Task06(str);
//Console.WriteLine(str);
//Console.ReadKey();

///*7.去掉字符串数组中每个字符串的空格*/
//string[] strArr = {" cf hr "," werwr et ewt twert ","ewf fa g" };
//strArr=MainClass.Task07(strArr);
//ShowStr(strArr);
//Console.WriteLine();
//Console.ReadKey();

///*8.随意输入你心中想到的一个书名，然后输出它的字符串长度。 （Length属性:可以得字符串的长度）*/
//Console.WriteLine("请输入一个书名");
//string bookName = Console.ReadLine();
//Console.WriteLine("这本书的名字长度为：{0}", MainClass.Task08(bookName));

///*9.两个学员输入各自最喜欢的游戏名称，判断是否一致,如果相等,则输出你们俩喜欢相同的游戏；如果不相同,则输出你们俩喜欢不相同的游戏。*/
//Console.WriteLine("请输入你的最喜欢的游戏名称");
//string gameName1 = Console.ReadLine();
//Console.WriteLine("请输入你的最喜欢的游戏名称");
//string gameName2 = Console.ReadLine();
//MainClass.Task09(gameName1,gameName2);
//Console.ReadKey();

///*10.上题中两位同学输入 lol和 LOL代表同一游戏，怎么办?*/
//Console.WriteLine("请输入你的最喜欢的游戏名称");
//string name1 = Console.ReadLine();
//Console.WriteLine("请输入你的最喜欢的游戏名称");
//string name2 = Console.ReadLine();
//MainClass.Task10(name1, name2);//同时转化成大写或者小写在进行比较
//Console.ReadKey();

///*11.让用户输入一个日期格式如“2008/08/08”，将输入的日期格式转换为“2008年-8月-8日”。*/
//string date = " 2017 /11 / 08 ";
//Console.WriteLine(MainClass.Task11(date));

///*12.接收用户输入的字符串，将其中的字符进行排序（升序），并以逆序的顺序输出，“cabed”→"abcde"→“edcba”。*/
//string str = "cabed";
//Console.WriteLine(MainClass.Task12(str));

///*13.接收用户输入的一句英文，将其中的单词以反序输出，“hello c sharp”→“sharp c hello”。*/
//string str = "hello c sharp";
//Console.WriteLine(MainClass.Task13(str));

///*14.从请求地址中提取出用户名和域名:http://www.163.com?userName=admin&pwd=123456*/
//string domain = null;
//string username = null;
//MainClass.Task14("http://www.163.com?userName=admin&pwd=123456", out username, out domain);
//Console.WriteLine("域名为：{0},用户名为：{1}", domain, username);

///*15.有个字符串数组，存储了10个书名，书名有长有短，现在将他们统一处理，若书名长度大于10，则截取长度8的子串并且最后添加“...”，加一个竖线后输出作者的名字。*/
//string[] strArr = new string[10];
//string[] autorArr = new string[10];
//strArr[0] = "平凡的世界";
//strArr[1] = "*的葬礼";
//strArr[2] = "挪威的森林";
//strArr[3] = "基督山伯爵";
//strArr[4] = "教父";
//strArr[5] = "苏菲的世界";
//strArr[6] = "白鹿原";
//strArr[7] = "建设有***";
//strArr[8] = "我爱祖国大地的美好山川和我可爱的家乡";
//strArr[9] = "关于物理学家彼得罗夫在圣彼得堡外科医学院借助有时由4200个铜环与锌环构成的巨大电池组所作的伽伐尼——伏打实验的消息";
//autorArr[0] = "路遥";
//autorArr[1] = "霍达";
//autorArr[2] = "村上春树";
//autorArr[3] = "大仲马";
//autorArr[4] = "马里奥·普佐";
//autorArr[5] = "乔斯坦·贾德";
//autorArr[6] = "陈忠实";
//autorArr[7] = "时建";
//autorArr[8] = "老四";
//autorArr[9] = "彼得罗夫";
//ShowStr(MainClass.Task15(strArr,autorArr));

///*16.让用户输入一句话,找出所有"呵"的位置。*/
//string str = "萨芬和呵啥地方基本框架呵家世界呵撒 暗示法三方 ";
//MainClass.Task16(str,'呵');

///*17.让用户输入一句话,找出所有"呵呵"的位置。*/
//string str = "萨芬和呵呵啥地方基本呵呵架呵呵家世呵呵呵呵呵呵界呵撒 暗示法呵呵三方 ";
//ShowList(MainClass.Task17(str, "呵呵呵"));

///*18.让用户输入一句话,判断这句话中有没有邪恶,如果有邪恶就替换成这种形式然后输出,如:“老牛很邪恶”,输出后变成”老牛很**”;*/
//string str = "老牛很邪恶";
//Console.WriteLine(MainClass.Task18(str,"邪恶"));

///*19.如何判断一个字符串是否为另一个字符串的子串*/
//string str1 = "sagasghgfhhrwj5";
//string str2 = "sagasghgfhhrwj5agvhg5a";
//Console.WriteLine(MainClass.Task19(str1,str2));

///*20.如何验证一个字符串中的每一个字符均在另一个字符串中出现过*/
//string str1 = "saghw";
//string str2 = "sage";
//Console.WriteLine(MainClass.Task20_01(str1, str2));

///*21.如何随机生成无数字的全字母的字符串*/
//Console.WriteLine(MainClass.Task21(10));//随机字母位数

///*22.如何随机生成带数字和字母的字符串*/
//Console.WriteLine(MainClass.Task22(10));//随机字母或数字位数

///*23.如何判定一个字符串中既有数字又有字母*/
//string str = "1548tbvj但是不会";
//Console.WriteLine(MainClass.Task23(str));

///*24.字符串内的字符排序（只按字母序不论大小写）*/
//string str = "DdbDHGBaGHgbhA";
//Console.WriteLine(MainClass.Task24(str));

///*25.字符串的补位操作
// 1 =》001
// 2 =》002
// 10 =》010*/
//int number = 100;
//MainClass.Task25(number);
//Console.WriteLine(str.PadLeft(2, '0'));//向左补位到共两位，补的字符是‘0’ 
//Console.WriteLine(str.PadRight(4, '0'));//向右补位到共四位，补的字符是‘0’

///*26.”DdBaGHgbhA”---? “abdghABDGH”-*/
//string str = "DdBaGHgbhA";
//Console.WriteLine(MainClass.Task26(str));
        }
static void ShowStr(string[] strArr)
        {
for (int i = 0; i < strArr.Length; i++)
            {
                Console.WriteLine(strArr[i] + " ");
            }
            Console.WriteLine();
        }
static void ShowIntArr(int[] arr)
        {
for (int i = 0; i < arr.Length; i++)
            {
                Console.Write(arr[i]+" ");
            }
            Console.WriteLine();
        }
static void ShowList(HashSet<int> hs)
        {
foreach (var item in hs)
            {
                Console.WriteLine(item);
            }
        }

 class MainClass
    {
public static string Task01(string str)
        {
string retStr = string.Empty;
for (int i = 0; i < str.Length; i++)
            {
if (str[i] != ' ')
                {
                    retStr = retStr + str[i];
                }
            }
return retStr;
        }
public static int Task03(string str)
        {
int count = 0;
            Regex regex = new Regex(@"^[\u4E00-\u9FA5]{0,}$");
for (int i = 0; i < str.Length; i++)
            {
if (regex.IsMatch(str[i].ToString()))
                {
                    count++;
                }
            }
return count;
        }
public static string Task04(string str, int number)//加密
        {
string retStr = string.Empty;
for (int i = 0; i < str.Length; i++)
            {
                retStr += (char)(str[i] + number) + " ";
            }
return retStr;
        }
public static string Task04_01(string str, int number)//破译
        {
string retStr = string.Empty;
for (int i = 0; i < str.Length; i++)
            {
if (str[i] != ' ')
                {
                    retStr += (char)(str[i] - number) + " ";
                }

            }
return retStr;
        }
public static string Task05_MyToUpper(string str)
        {
string retStr = string.Empty;
for (int i = 0; i < str.Length; i++)
            {
if (str[i] >= 'a' && str[i] <= 'z')
                {
                    retStr += char.ToUpper(str[i]);
continue;
                }
                retStr += str[i];
            }
return retStr;
        }
public static string Task05_MyToLower(string str)
        {
string retStr = string.Empty;
for (int i = 0; i < str.Length; i++)
            {
if (str[i] >= 'A' && str[i] <= 'Z')
                {
                    retStr += char.ToLower(str[i]);
continue;
                }
                retStr += str[i];
            }
return retStr;
        }
public static string Task06(string str)
        {
string retStr = string.Empty;
for (int i = 0; i < str.Length; i++)
            {
if (str[i] == '，' || str[i] == '、' || str[i] == '。')
                {
                    retStr += '\n';
continue;
                }
                retStr += str[i];
            }
return retStr;
        }
public static string[] Task07(string[] strArr)
        {
string[] retStr = new string[strArr.Length];
for (int i = 0; i < strArr.Length; i++)
            {
                retStr[i] = MainClass.Task01(strArr[i]);
            }
return retStr;
        }
public static int Task08(string str)
        {
return str.Length;
        }
public static void Task09(string str1, string str2)
        {
if (str1 == str2)
            {
                Console.WriteLine("你们俩喜欢相同的游戏");
            }
else
            {
                Console.WriteLine("你们俩喜欢不相同的游戏");
            }
        }
public static void Task10(string str1, string str2)//不区分大小写
        {
if (Task05_MyToLower(str1) == Task05_MyToLower(str2))
            {
                Console.WriteLine("你们俩喜欢相同的游戏");
            }
else
            {
                Console.WriteLine("你们俩喜欢不相同的游戏");
            }
        }
public static string Task11(string str)//此类问题优先选择字符拼接，字符（串）替换会影响原来字符串的长度，有可能会溢出
        {
            str = Task01(str);
int count = 1;
string retDate = string.Empty;
for (int i = 0; i < str.Length; i++)
            {
if (str[i] == '/' && count == 1)
                {
if (str[i + 1] == '0')
                    {
                        retDate += "年-";
                        count++;
                        i++;
                    }
else
                    {
                        retDate += "年-";
                        count++;
                    }
continue;
                }
if (str[i] == '/' && count == 2)
                {
if (str[i + 1] == '0')
                    {
                        retDate += "月-";
                        i++;
                    }
else
                    {
                        retDate += "月-";
                    }
continue;
                }
                retDate += str[i];
            }
            retDate += '日';
return retDate;
        }
public static string Task12(string str)
        {
char[] chArr = new char[str.Length];
            chArr = str.ToCharArray();
for (int i = 0; i < chArr.Length - 1; i++)//冒泡算法，外层表示趟数，内层表示每趟需要交换的次数
            {
for (int j = 0; j < chArr.Length - i - 1; j++)
                {
if (chArr[j] > chArr[j + 1])
                    {
char temp = ' ';
                        temp = chArr[j];
                        chArr[j] = chArr[j + 1];
                        chArr[j + 1] = temp;
                    }
                }
            }
string ret = string.Empty;
for (int i = 0; i < chArr.Length; i++)
            {
                ret = chArr[i] + ret;
            }
return ret;
        }
public static string Task13(string str)
        {
string[] words = str.Split(' ','&','^');//把字符串按“ ”进行分割，放到字符串数组
//Console.WriteLine(words.Length);
string retStr = string.Empty;
//输出方法一
//for (int i = words.Length - 1; i >= 0; i--)//倒序输出字符串数组中的元素
//{
// retStr += words[i] + ' ';
//}
            Array.Reverse(words);
//输出方法二
//for (int i = 0; i < words.Length; i++)
//{
// retStr += words[i]+" ";
//}
//输出方法三
foreach (var item in words)
            {
                retStr += item + " ";
            }
return retStr;
        }
public static void Task14(string url, out string username, out string domain)
        {
            username = "";
            domain = "";
string[] tmpArrD = url.Split('.', '?');
            domain = tmpArrD[1] + '.' + tmpArrD[2];
string[] tmpArrU = url.Split('=', '&');
            username = tmpArrU[1];
        }
public static string[] Task15(string[] nameArr, string[] autorArr)
        {
for (int i = 0; i < nameArr.Length; i++)
            {
if (nameArr[i].Length > 10)
                {
                    nameArr[i] = nameArr[i].Substring(0, 8) + "..." + "|" + autorArr[i];
continue;
                }
                nameArr[i] = nameArr[i] + "|" + autorArr[i];
            }
return nameArr;
        }
public static void Task16(string str, char ch)
        {
for (int i = 0; i < str.Length; i++)
            {
if (str[i] == ch)
                {
                    Console.Write(i + 1 + " ");
                }
            }
            Console.WriteLine();
        }
public static HashSet<int> Task17(string str1, string str2)
        {
int count = 0;
for (int i = 0; i < str1.Length - str2.Length + 1; i++)
            {
for (int j = 0; j < str2.Length; j++)
                {
if (str2[j] != str1[i + j])
                    {
break;
                    }
if (j == str2.Length - 1)
                    {
                        count++;
                        i = i + str2.Length - 1;
break;
                    }
                }
            }
//Console.WriteLine(count);
            HashSet<int> hs = new HashSet<int>();
int temp = 0;
for (int i = 1; i <= count; i++)
            {
                temp = str1.IndexOf(str2, temp + str2.Length);
                hs.Add(temp);
            }
return hs;
        }
public static string Task18(string str, string str2)
        {
            str = str.Replace(str2, "**");
return str;
        }
public static bool Task19(string str1, string str2)
        {
if (str1.Length < str2.Length)
            {
string tmp = string.Empty;
                tmp = str1;
                str1 = str2;
                str2 = tmp;
            }
for (int i = 0; i < str1.Length - str2.Length + 1; i++)
            {
for (int j = 0; j < str2.Length; j++)
                {
if (str2[j] != str1[i + j])
                    {
break;
                    }
if (j == str2.Length - 1)
                    {
return true;
                    }
                }
            }
return false;
        }
public static bool Task20(string str1, string str2)
        {
if (str1.Length < str2.Length)
            {
string tmp = string.Empty;
                tmp = str1;
                str1 = str2;
                str2 = tmp;
            }
            HashSet<char> chhs = new HashSet<char>();
for (int i = 0; i < str2.Length; i++)
            {
                chhs.Add(str2[i]);
            }
foreach (var item in chhs)
            {
if (str1.Contains(item) == false)
                {
return false;
                }
            }
return true;
        }
public static bool Task20_01(string str1, string str2)
        {
for (int i = 0; i < str2.Length; i++)
            {
if (str1.Contains(str2[i]) == false)
                {
return false;
                }
            }
return true;
        }
public static string Task21(int length)
        {
            Random random = new Random();
string str = string.Empty;
while (str.Length < length)
            {
int temp = random.Next(1, 200);
if (temp >= 'A' && temp <= 'Z' || temp >= 'a' && temp <= 'z')
                {
                    str += (char)temp;
                }
            }
return str;
        }
public static string Task22(int length)
        {
            Random random = new Random();
string str = string.Empty;
while (str.Length < length)
            {
int temp = random.Next(1, 200);
if (temp >= 'A' && temp <= 'Z' || temp >= 'a' && temp <= 'z' || temp >= '0' && temp <= '9')
                {
                    str += (char)temp;
                }
            }
return str;
        }
public static bool Task23(string str)
        {
for (int i = 0; i < str.Length; i++)
            {
if (str[i] >= 'A' && str[i] <= 'Z' || str[i] >= 'a' && str[i] <= 'z')
                {
for (int j = 0; j < str.Length; j++)
                    {
if (str[j] >= '0' && str[j] <= '9')
                        {
return true;
                        }
                    }
                }
            }
return false;
        }
public static string Task24(string str)
        {
string bigWords = string.Empty;
string smallWords = string.Empty;
for (int i = 0; i < str.Length; i++)
            {
if (str[i] >= 'A' && str[i] <= 'Z')
                {
                    bigWords += str[i];
                }
if (str[i] >= 'a' && str[i] <= 'z')
                {
                    smallWords += str[i];
                }
            }
//Console.WriteLine("大写:{0}",bigWords.Length);
//Console.WriteLine("小写:{0}", smallWords.Length);
string temp = Task05_MyToLower(str);
char[] chArr = temp.ToCharArray();
            Array.Sort(chArr);
string retStr = string.Empty;
for (int i = 0; i < chArr.Length; i++)
            {
if (bigWords.Contains((char)(chArr[i] - 'a' + 'A')))
                {
                    retStr += (char)(chArr[i] - 'a' + 'A');
                    bigWords = bigWords.Remove(bigWords.IndexOf((char)(chArr[i] - 'a' + 'A')),1);
continue;
                }
                retStr += chArr[i];
            }
return retStr;
        }
public static void Task25(int endNumber)
        {
for (int i = 1; i <= endNumber; i++)
            {
string str = i.ToString();
if (str.Length / i == 0 || str.Length / i == 1)
                {
                    str = str.PadLeft(str.Length + 1, '0');
                }
                Console.WriteLine(str);
            }
        }
public static string Task26(string str)
        {
char[] chArr = str.ToCharArray();
string bigWords = string.Empty;
string smallWords = string.Empty;
for (int i = 0; i < chArr.Length; i++)
            {
if (chArr[i]>='a'&&chArr[i]<='z')
                {
                    smallWords += chArr[i];
                }
if (chArr[i] >= 'A' && chArr[i] <= 'Z')
                {
                    bigWords += chArr[i];
                }
            }
char[] chBigArr = bigWords.ToCharArray();
char[] chSmallArr = smallWords.ToCharArray();
            Array.Sort(chSmallArr);
            Array.Sort(chBigArr);
            smallWords = new string(chSmallArr);
            bigWords = new string(chBigArr);
return smallWords+bigWords;
        }
    }