Read Write Text File in c#, The old fashion storage system.
Name : A simply file read and write in CS.
Topics Covered: File read-write, File size calculation, random functions (different ways).
The problems are :
A. Write a program that will generate 4 types of “printable" random objects and store them in a single file, each object will be separated by a ",".
These are the 4 objects:
1. alphabetical strings
2. real numbers
3. integers
4. alphanumerics.
*The alphanumerics should contain a random number of spaces before and after it (not exceeding 10 spaces).
The output should be 20MB in size.
Sample extracted output :
youruasdifafasd, 127371237, asdfka12348fas,13123.123,
asjdfklasdjfklaasf, 123192u3kjwekhf , 89181811238,122,
jslfhasjdfa900jkifh , 3.781, 2.11, ....
B. Write a program that will read the generated file above and print to the console the object and its type .Spaces before and after the alphanumeric object must be stripped.
Sample output :
youruasdifafasd - alphabetical strings
127371237 - integer
asdfka12348fas - alphanumeric
13123.123 - real numbers
asjdfklasdjfklaasf - alphabetical strings
123192u3kjwekhf – alphanumeric
Solve of problem 1 : Step 1: Start a c# console application in dot net.
Step 2: Make a class named RandomStringGenerator. The main responsibility of the class is to generate the numbers randomly as required in problem domain.
Step 3: Copy the following code :
Topics Covered: File read-write, File size calculation, random functions (different ways).
The problems are :
A. Write a program that will generate 4 types of “printable" random objects and store them in a single file, each object will be separated by a ",".
These are the 4 objects:
1. alphabetical strings
2. real numbers
3. integers
4. alphanumerics.
*The alphanumerics should contain a random number of spaces before and after it (not exceeding 10 spaces).
The output should be 20MB in size.
Sample extracted output :
youruasdifafasd, 127371237, asdfka12348fas,13123.123,
asjdfklasdjfklaasf, 123192u3kjwekhf , 89181811238,122,
jslfhasjdfa900jkifh , 3.781, 2.11, ....
B. Write a program that will read the generated file above and print to the console the object and its type .Spaces before and after the alphanumeric object must be stripped.
Sample output :
youruasdifafasd - alphabetical strings
127371237 - integer
asdfka12348fas - alphanumeric
13123.123 - real numbers
asjdfklasdjfklaasf - alphabetical strings
123192u3kjwekhf – alphanumeric
Solve of problem 1 : Step 1: Start a c# console application in dot net.
Step 2: Make a class named RandomStringGenerator. The main responsibility of the class is to generate the numbers randomly as required in problem domain.
Step 3: Copy the following code :
public class RandomStringGenerator
{ public RandomStringGenerator() {}
private string RandomString()
{ StringBuilder builder = new StringBuilder(); Random random = new Random(); char ch;for (int i = 0; i < Convert.ToInt32(Math.Floor(100 * random.NextDouble())); i++)
{ch = Convert.ToChar(
Convert.ToInt32(
Math.Floor(26 * random.NextDouble() + 65)));
builder.Append(ch);
}
return builder.ToString().ToLower() + ",";
}
private string RandumInteger()
{ Random random = new Random();return random.Next().ToString().ToLower() + ",";
}
private string RandomRealNumber()
{ Random random = new Random();return (random.NextDouble() * random.Next()).ToString().ToLower() + ",";
}
private string RandumIntegerForOwn()
{ Random random = new Random(); return random.Next().ToString().ToLower();}
private string RandomStringForOwn()
{ StringBuilder builder = new StringBuilder(); Random random = new Random(); char ch;for (int i = 0; i < Convert.ToInt32(Math.Floor(100 * random.NextDouble())); i++)
{ch = Convert.ToChar(
Convert.ToInt32(
Math.Floor(26 * random.NextDouble() + 65)));
builder.Append(ch);
}
return builder.ToString().ToLower();}
private string RandomSpace()
{ StringBuilder builder = new StringBuilder(); Random random = new Random(); char c;for (int i = 0; i <= random.Next(10); i++)
{ c = ' ';builder.Append(c);
}
return builder.ToString();}
private string RandomAlphaNeweric()
{ StringBuilder builder = new StringBuilder(); Random random = new Random();for (int i = 0; i < Convert.ToInt32(Math.Floor(10 * random.NextDouble())); i++)
{ string output; if ((i % 2) == 0) {output = RandomStringForOwn() + RandumIntegerForOwn();
}
else {output = RandumIntegerForOwn() + RandomStringForOwn();
}
builder.Append(output);
}
return RandomSpace() + builder.ToString().ToLower() + RandomSpace() + ",";
}
public string StringOutPut()
{ StringBuilder builder = new StringBuilder(); Random random = new Random(); int select;for (int i = 0; i < Convert.ToInt32(Math.Floor(1000000 * random.NextDouble())); i++)
{select = random.Next(1, 4);
if (select == 1) {builder.Append(RandomString());
}
else if (select == 2)
{builder.Append(RandumInteger());
}
else if (select == 3)
{builder.Append(RandomRealNumber());
}
else {builder.Append(RandomAlphaNeweric());
}
}
return builder.ToString();}
}
Step 4: Make a class named : OutPutManager : The main responsibility of the class is to save the string in the file until the file size is as like as given size.
Step 5 : Copy the following code:
Step 5 : Copy the following code:
using System.IO;public class OutPutManager
{private string filePath = "c:\\output.txt";
private long fileSize = 20971520;
private long GetFileSizeString()
{FileInfo info = new FileInfo(filePath);long size = info.Length;return size;}
public void WriteToFile(String lines)
{ TextWriter tw = new StreamWriter(filePath);while (GetFileSizeString() <= fileSize){tw.WriteLine(lines);
}
tw.Close();
}
}
Step 6: In the main program copy the following code under main :
RandomStringGenerator rd = new RandomStringGenerator();OutPutManager output = new OutPutManager();output.WriteToFile(rd.StringOutPut());
Step 7: Compile the code and run , you will find a file in C:\output.txt who’s size is 20Mb
Solve of problem 2 : Step 1: Start a c# console application in dot net.
Step 2: Make a class named Reader : The main respectability is to read string from a text file and it makes strings part by part to check the type of string as it is told.
Step 3 : Copy the following code there
Solve of problem 2 : Step 1: Start a c# console application in dot net.
Step 2: Make a class named Reader : The main respectability is to read string from a text file and it makes strings part by part to check the type of string as it is told.
Step 3 : Copy the following code there
using System.IO;public class Reader
{ public string ReadFromFile(string filePath)
{string s;TextReader tr = new StreamReader(filePath);s = tr.ReadToEnd();
tr.Close();
return s;}
public void ExecutorOfStringCking(string input)
{char[] inputString = input.ToCharArray();string getSt;Checker ckString = new Checker();int start = 0,i = 0; for (i = 0; i < input.Length; i++){if (input[i] == ',')
{getSt = input.Substring(start, i-start );
start = i + 1;
System.Console.WriteLine(getSt + ckString.CatagoryOf(getSt));
}
}
}
}
Step 4:
Make a class Checker : The main responsibility of the class is to check the category of a string if it is like as asked in the problem.
Step 5: Copy the following code in the class
Make a class Checker : The main responsibility of the class is to check the category of a string if it is like as asked in the problem.
Step 5: Copy the following code in the class
public class Checker
{public string CatagoryOf(string input)
{if(input.IndexOf(' ')==0)
{ return " - alphanumeric";
}
else if(input.IndexOf('.')>=0)
{return " - real numbers";
}
else {if (IsInteger(input)){return " - integer";
}
else{return " - alphabetical strings";
}
}
}
private bool IsInteger(string input)
{int counter =0;for (int i = 0; i < input.Length; i++)
{if (input[i] == '0' ||
input[i] == '1' ||input[i] == '2' ||input[i] == '3' ||input[i] == '4' ||input[i] == '5' ||input[i] == '6' ||input[i] == '7' ||input[i] == '8' ||input[i] == '9'){counter++;
}
}
if (counter < input.Length){return false;
}
elsereturn true;
}
}
Step 6:
Copy the following step in the main
Copy the following step in the main
string filePath = "c:\\output.txt";
string getString ; Reader rd = new Reader();getString=rd.ReadFromFile(filePath);
rd.ExecutorOfStringCking(getString);
Console.ReadLine();
Step 7:
Compile the code and run .
Note: you need a file in C:\output.txt .(will be generates if the first program is run).
……………..We are done...:)
Compile the code and run .
Note: you need a file in C:\output.txt .(will be generates if the first program is run).
……………..We are done...:)