Скачать или смотреть Associative containers collections in c++ and c# unordered_map Hashtable 27

Learn how to define #associative #containers/#collections like #unordered_map and #Hashtable and how to read elements stored in these in c plus plus and c sharp.

c++ code:

#include ＜iostream＞ //for cout
#include ＜fstream＞ // for ofstream/ifstream
#include ＜string＞ //for ＜＜ and getline
#include ＜map＞//for map
#include ＜unordered_map＞

int main(int argc, char *argv[])
{
std::ifstream input_file("test.txt");
std::ofstream output_file("test.txt.out");

std::string line;

//std::map＜std::string, int＞ elements;//associative
std::unordered_map＜std::string, int＞ elements;

for (int line_no = 1; std::getline(input_file, line); ++line_no)
{
//elements.insert(std::make_pair(line, line_no));
elements.insert({ line, line_no });
//elements[line] = line_no;
}

////std::map＜std::string, int＞::iterator iter = elements.begin();
//std::unordered_map＜std::string, int＞::iterator iter = elements.begin();
//for(; iter != elements.end(); iter++)
//{
// std::cout ＜＜ "LINE " ＜＜ (*iter).second ＜＜ ":" ＜＜ (*iter).first ＜＜ std::endl;
// output_file ＜＜ "LINE " ＜＜ (*iter).second ＜＜ ":" ＜＜ (*iter).first ＜＜ std::endl;
//}

std::cout ＜＜ elements["This is Arif."] ＜＜ std::endl;

if (input_file)
{
input_file.close();
output_file.close();
}

std::cin.get();
return 0;
}



c# code:
using System;//for Console
using System.Collections.Generic;//for List and Dictionary
using System.IO;//to use StreamReader
using System.Collections;

namespace lec2csharp
{
class Program
{
static void Main(string[] args)
{
StreamReader input_file = new StreamReader("test.txt");
StreamWriter output_file = new StreamWriter("test.txt.out");

string line = "";

//Dictionary＜String, int＞ elements = new Dictionary＜string, int＞();
Hashtable elements = new Hashtable();

for (int line_no = 1; (line = input_file.ReadLine()) != null; ++line_no)
{
elements.Add(line, line_no);
//elements[line] = line_no;
}

//foreach (KeyValuePair＜string, int＞ iter in elements)
//{
// Console.WriteLine("LINE {0} :{1}", iter.Value, iter.Key);
// output_file.WriteLine("LINE {0} :{1}", iter.Value, iter.Key);
//}

//foreach (string iter in elements.Keys)
////foreach (int iter in elements.Values)
//{
// Console.WriteLine("LINE {0} ", iter);
// output_file.WriteLine("LINE {0} ", iter);
//}

Console.WriteLine(elements["This is Arif."]);

if (input_file != null)
{
input_file.Close();
output_file.Close();
}

Console.ReadLine();
}
}
}


#cplusplus #csharp #tutorial

C++ Associative containers c# unordered map Hashtable
c++ Associative containers c# map Dictionary
How to use Hashtable in C#