convert a program from Java to C++ Need help converting this program from java t

Question

convert a program from Java to C++

Need help converting this program from java to c++

// include file reading libraries
import java.io.*;
import java.util.LinkedList; // include linked list

public class Packet4 {

// main method -- similar to int main() in C++
public static void main(String[] args) throws IOException
{
  // file reading code
  File dataFile = new File("data.txt");  
  FileInputStream stream = new FileInputStream(dataFile);  
  BufferedReader reader = new BufferedReader(new InputStreamReader(stream));

  String line = null;
  
  // allocate linked list
  LinkedList<String> packetsList = new LinkedList<>();  
  
  // read line by line. loop is done when end of file is reached
  while ((line = reader.readLine()) != null)
  {            
   // allocate a node, put stuff in there, then insert into the list
   packetsList.add(line);   
  }
  
  int nextExpected = 1; // the lowest sequence number in data.txt is 1
  String previousPacketData = "";
  
  // while nextExpected is not greater than list size
  while (nextExpected <= packetsList.size())
  {
   // loops through all packets in list trying to find next-expected
   for (int i = 0; i < packetsList.size(); i++)
   {
    String packet = packetsList.get(i); // get packet from list. does NOT remove it from list
    
    String sequenceNumberStr = packet.substring(0,4); // first 4 characters
    
    // remove spaces e.g. converts " 23" to "23"
    sequenceNumberStr = sequenceNumberStr.trim();     
    
    // convert to integer
    int sequenceNumberInt = Integer.parseInt(sequenceNumberStr);
    
    // check if packet is the next expected packet
    if (nextExpected == sequenceNumberInt)
    {
     String packetData = packet.substring(4,16); // character 5 - 16
     packetData = packetData.replace("=+", " ");
     
     // Gotcha: sometimes the = and the + are in different packets
     if (previousPacketData.endsWith("=") && packetData.startsWith("+"))
     {
      previousPacketData = previousPacketData.replace("=", "");
      packetData = packetData.replace("+", " ");
     }
     
     System.out.print(previousPacketData); // print the previous packet data
     
     // save packet for later printing, and for the 'gotcha' situation
     previousPacketData = packetData;    
     
     nextExpected = nextExpected + 1; // increment next-expected counter
    }
   }
  }
  
  System.out.print(previousPacketData); // print the last piece

  reader.close();
}
}

//input file

----------
   4rnighan - .
   9is a compute.
26ls or GOTO's.
79ibraries.=+=.
20acilities=+s.
67the first=+s.
24n the page, .
   2ion to C - .
57efinitions. .
63ave a main. .
   6ories, Murra.
41ilities.=+=+.
40ucturing fac.
60, and in fac.
84ons is by ar.
10r language a.
   5Bell Laborat.
71invoke other.
95nts, indicat.
25without labe.
82ting data be.
   8 Jersey. C .
13. C lets yo.
   7y Hill,=+New.
   3 Brian W. Ke.
52or the proce.
18as decent co.
29e that is co.
   1An Introduct.
22can be read .
80+One method .
21o your code .
44one or more .
47ilar to the=.
81of communica.
98e the statem.
86e=+parenthes.
43consists of .
68tatement of .
38 provides go.
90und the argu.
99ents=+of the.
46hich are sim.
49nd subroutin.
88 the functio.
92ere main=+is.
103d with a sem.
102tatements en.
37tion; and it.
101Individual s.
72 functions t.
96ed by ( ). T.
45functions, w.
69main. main w.
27;=+it lets y.
73o perform it.
53dures of PL/.
16learly and s.
42A C program .
51ran program .
77ogram, and o.
74s=+job, some.
94of no argume.
12many systems.
64 Execution o.
11vailable on .
93 a function .
87es following.
78thers from l.
31t being too .
28ou write cod.
35nd good prog.
91ment list; h.
75 coming from.
59h a function.
97he {} enclos.
62grams must h.
14u=+write you.
30mpact withou.
23straight dow.
17imply - it h.
76 the same pr.
65f the progra.
19ntrol flow f.
106=+free-forma.
54I, and=+perh.
61t=+all C pro.
89n name surro.
56ernal data d.
50es of a Fort.
33+encourages .
105re otherwise.
15r programs c.
66m begins at .
32cryptic; it=.
104icolon but a.
85guments. Th.
83tween functi.
39od=+data-str.
48+functions a.
100 function. .
107t.=+=+      .
58 main is suc.
55aps some ext.
70ill usually .
34modularity a.
36ram organiza.

Explanation / Answer

please find the code below for any clarifications comment below. Happy to help you.

using System;

using System.Collections.Generic;

public class Packet4

{

// main method -- similar to int main() in C++

//ORIGINAL LINE: public static void main(String[] args) throws IOException

public static void Main(string[] args)

{

// file reading code

File dataFile = new File("data.txt");

FileInputStream stream = new System.IO.FileStream(dataFile, System.IO.FileMode.Open, System.IO.FileAccess.Read);

BufferedReader reader = new System.IO.StreamReader(stream);

string line = null;

// allocate linked list

LinkedList<string> packetsList = new LinkedList<string>();

// read line by line. loop is done when end of file is reached

while (!string.ReferenceEquals((line = reader.ReadLine()), null))

{

// allocate a node, put stuff in there, then insert into the list

packetsList.AddLast(line);

}

int nextExpected = 1; // the lowest sequence number in data.txt is 1

string previousPacketData = "";

// while nextExpected is not greater than list size

while (nextExpected <= packetsList.Count)

{

// loops through all packets in list trying to find next-expected

for (int i = 0; i < packetsList.Count; i++)

{

string packet = packetsList.get(i); // get packet from list. does NOT remove it from list

string sequenceNumberStr = packet.Substring(0,4); // first 4 characters

// remove spaces e.g. converts " 23" to "23"

sequenceNumberStr = sequenceNumberStr.Trim();

// convert to integer

int sequenceNumberInt = int.Parse(sequenceNumberStr);

// check if packet is the next expected packet

if (nextExpected == sequenceNumberInt)

{

string packetData = packet.Substring(4, 12); // character 5 - 16

packetData = packetData.Replace("=+", " ");

// Gotcha: sometimes the = and the + are in different packets

if (previousPacketData.EndsWith("=", StringComparison.Ordinal) && packetData.StartsWith("+", StringComparison.Ordinal))

{

previousPacketData = previousPacketData.Replace("=", "");

packetData = packetData.Replace("+", " ");

}

Console.Write(previousPacketData); // print the previous packet data

// save packet for later printing, and for the 'gotcha' situation

previousPacketData = packetData;

nextExpected = nextExpected + 1; // increment next-expected counter

}

}

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