Practise C#:

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

class Program

{

static void Main(string[] args)

{

int i, j, sum = 0;

bool prim; // To log a number whether a prime;

prim = true;

for (i = 2; i <= 100; i++)

{

for (j = 2; j < (int) Math.Sqrt(i)+1; j++)

{

if ((i % j) == 0) // This number is not a prime, jump out and find the next;

{

prim = false;

break;

}

//else // “else” here was implied to apply, equal to show it;

{

prim = true;

}

if (prim == true) // This is a prime, print it and then adding it to “sum”;

{

Console.Write(i+ ", ");

sum += i;

}

Console.WriteLine("sum={0} ", sum);

Console.ReadLine();

}

using System;

using System.IO;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

namespace ConsoleApplication1

{

class Program

{

static void Main(string[] args)

{

Console.WriteLine( "please give a full test location such as: d:\\temp" ); // Let user give a location;

string pathtostart = Console.ReadLine();

DirectoryInfo f = new DirectoryInfo( pathtostart );

if (f.Exists == true)

{

Console.WriteLine("Directory have existed, please re-input location again...");

pathtostart = Console.ReadLine(); // Inputted location will be the root directory;

f = new DirectoryInfo(pathtostart);

} while (f.Exists == true); // It will be acceptable only when this is a new location;

}

// Following lines start to initialize the files and subfolders in the location:

Directory.CreateDirectory(pathtostart + "\\1"); // Create subdirectory;

Directory.CreateDirectory(pathtostart + "\\2");

File.Create(pathtostart + "\\1.doc").Close(); // Create sub file, then close it is necessary;

File.Create(pathtostart + "\\2.doc").Close();

Directory.CreateDirectory(pathtostart + "\\1\\1");

File.Create(pathtostart + "\\1\\1\\1.doc").Close(); // Create multi hierarchy file;

File.Create(pathtostart + "\\1\\1\\2.doc").Close();

Console.WriteLine("Initialize default complete, you could view it now...");

String Action1;

{

Console.WriteLine("Do you want to rename all files (.doc-->.txt)in this folder now? y/n");

Action1 = Console.ReadLine();

}

while (Action1 != "y"); // User want to start change them now ?

FindDirectory(pathtostart); // Start change all, invoke method “FindDirectory”;

Console.WriteLine("Completely!! Please check it now... ");

Console.ReadLine();

}

public static void FindDirectory(string BaseDir) // Recursion all directories in root location;

{

DirectoryInfo Finddir = new DirectoryInfo(BaseDir);

DirectoryInfo[] Add = Finddir.GetDirectories();

if (Directory.GetFiles(BaseDir).Length > 0) // If first level have files, change them;

StartToChange (BaseDir);

if (Add.Length == 0) // If no any sub directory in this level, then start change;

StartToChange(BaseDir);

else // if sub directory existing, Recursion it;

{

for (int i = 0; i < Add.Length; i++)

FindDirectory(Add[i].FullName);

}

public static void StartToChange (string path_last) // Start replace files in directory;

{

string path;

path = path_last;

int N;

DirectoryInfo dir = new DirectoryInfo(path); // Get one directory info to “dir”;

N = System.IO.Directory.GetFiles(path, "*.doc").Length; // Record total number of all .doc files;

FileInfo[] listfile = dir.GetFiles("*.doc");

for (int j = 0; j < N; j++) // Start to change file name one bye one;

{

string s = listfile[j].Name;

int a = s.IndexOf(".");

string filename = s.Substring(0, a); // Get the filename string before .doc;

string filename1 = filename + ".txt"; // And using the getting string to create .txt string;

string path0 = path + "\\" + listfile[j]; // Get its absolute path;

string path01 = path + "\\" + filename1;

File.Move(path0, path01); // Replace the name completely;

}

3.1

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

class Program

{

static void Main(string[] args)

{

string S, S1 = "";

Console.WriteLine("please input the string you want to change...");

S = Console.ReadLine();

char[] C = S.ToCharArray(); // Change the string to array characters;

int length = S.Length; // Record the length of the array;

for (int i = 0; i < length; i++)

{

if (char.IsLower(C[i])) // Is a lower character?

C[i]=Char.ToUpper(C[i]); // Reverse it;

else if (char.IsUpper(C[i])) // Or is a upper character?

C[i] = Char.ToLower(C[i]); // Reverse it;

S1 += C[i].ToString();

}

Console.WriteLine("old letters are: {0}", S);

Console.WriteLine("new letters are: {0}", S1);

Console.ReadLine();

}

3.2

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

class Program

{

static int i = 0;

static void Main(string[] args)

{

// To test input-box for limitation reports to view in report,case expected actions are:

// 1>it only allow to input int numbers,and the range must be int>=0;

// 2> give warning message once input a character;

// 3> the input int number with no limitation for Max, all will be acceptable if it >0

// 4> input with only '0' without any response, but with no any warning info also

// 5> input such as "003565",without any warning info, but saved data will delete pre_index sring "00"

Console.WriteLine("Please input the data into report...");

string s_input = Console.ReadLine();

Char[] Array = s_input.ToCharArray();

Boolean AcceptData = true;

for (int k = 0; k < Array.Length; k++)

{

if (Array[k] >= '0' && Array[k] <= '9')

{

int j = (int)Array[k] - 48; // Asc.II make it from character->number;

int data = (i * 10) + j;

i = data; // Revise the characters to an actual value;

AcceptData = true;

}

else

{

Console.WriteLine("Unacceptable character, you can only type a number here!");

AcceptData = false;

break; // Veto as soon as met a un_number character;

}

if (AcceptData)

Console.WriteLine("the saved value actually was :{0}", i);

Console.ReadLine();

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace TestgroupInBeijing

{

class Program

{

static void Main(string[] args)

{

TeamAutomatic Autogroup1= new TeamAutomatic();

TeamAutomatic Autogroup2= new TeamAutomatic();

TeamFunctional Funcgroup1= new TeamFunctional();

TeamFunctional Funcgroup2 = new TeamFunctional();

Leader KscLeader = new Leader("aaa");

Leader KesLeader = new Leader("bbb");

// Add more info for testgroup...

// show test group Beijing structure

Console.ReadKey(true);

}

public interface ITester // public interface, all test group in BeiJing share it;

{

int employee_ID;

string name;

string pcID;

void worker();

private void Behavior();

}

public abstract class Team // create an abstract class for team

{

public int x; // general public member

string teamname;

public void A(int m)

{

x = m;

} // struct function

abstract public int fun1(); // alert abstract function

}

public class Leader : ITester

{

string teamname;

string leadername;

int teammembers;

string teamproductname;

void Behavior();

public void Leader(string leadername)

{

this.leadername = leadername;

}

void responsiblities(int N, String tasknames)

{

// what Leader's tasks,for one by one

}

public class general_tester : ITester

{

int level;

private void Behavior();

}

public class senior_tester : ITester

{

int level;

private void Behavior();

}

public class TeamAutomatic : Team

{

public int x;

string product1;

string product2;

int Totalnum;

int Maletotal;

int Femaltoal;

public void A(int m, int n)

{

}

public int fun1(); // fufill abstract class's fuction

}

public class TeamFunctional : Team

{

public int x;

string product1;

string product2;

int Totalnum;

int Maletotal;

int Femaltoal;

public void A(int m, int n)

{

//dosomething here

}

public int fun1(); // fufill abstract class's fuction

}

public class manager : Leader, ITester

{

string team_name;

int level;

void Behavior(); // overwrited something

void responsiblities(int N, String tasknames)

{

//what manager's tasks,for one by one

}

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