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Parsing command line parameters.

n1xsan (3)
I have a school assignment: I have to make a c++ program, in which with an algorithm I have to code a text from a file and write it to another file. The input should like this: "code forCoding.txt toBeWritten.txt" ; or like this: "decode toBeReadFor.txt toBeWrittenIn". I have done everything except one thig: It is says I have to be able to input parameter. How should i write this? I read http://www.cplusplus.com/articles/DEN36Up4/, but still dont get. The input of my program has to have 3 strings, so I guess argc should be 3, but I dont really get it. Can someone write it for me, or at least to say what should I have in my main about this parsing command line parameters?
megasnorlax (90)
Can you show your code so far right now? I want more of an idea of what you're doing.
n1xsan (3)
Sure! This is my main class and i have a another 2 classes.
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#include <iostream>
#include "include/coder.h"
#include "include/decoder.h"

using namespace std;

int main()
{


    string nameIn, nameCd,type;

    cin>>type;
   cin>>filename1>>filename2;


    if(type=="code")
    {
        coder *c= new coder(filename1,filename2);
    }
    else if(type=="decode")
    {
        decoder *dcdr=new decoder(filename2,filename1);
    }
    else
    {
        cout<<"not a right input";
    }



    return 0;
}

The class for the coding
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#include "../include/coder.h"
#include<iostream>
#include<string.h>
#include <fstream>
using namespace std;

coder::coder()
{


}
coder::coder(string nameIn,string nameOut)
{

    setFileIn(nameIn);
    codirai();
    setFileOut(nameOut);
}

void coder:: setFileIn(string filename)
{
    ifstream reader;

    reader.open(filename.data(), ios::in);
    if(reader.is_open())
    {

        reader.seekg(0, ios::end);
        int length = reader.tellg();
        reader.seekg(0, ios::beg);
        char qwe[length];
        reader.read(qwe, length);
        string result(qwe);
        int k = reader.gcount();
        result = result.substr(0, k);
        reader.close();
        setText(result);

    }
    else
    {
        cout<<"Greshka pri otvarqneto na file za kodirane";
    }
}
void coder:: setFileOut(string filename)
{

    ofstream myfile;
    myfile.open(filename.c_str());
    myfile<<getCoded();
    myfile.close();
}
void coder::setText(string niki)
{
    if(niki!="")text=niki;
    else {
        cout<<"Tekstut za kodiranet e vuveden greshno!";
        text="BLQH";
    }
}
string coder::getCoded()
{
    return coded;
}
void coder::setCoded(string gshit)
{
    if(gshit!="") coded=gshit;
    else {
        cout<<"Greshka pri kodiraneto!";
        coded="BLQH";
    }
}
void coder::codirai()
{

    string coded1;
    int n,k,t;
    n=getText().size();
    cout<<getText();


    //get nai-blizko

    int  razlika=n-1,naiblizko=1;
    for(int i=2; i<n; i++)
    {
        if(n-(i*i)<0) break;

        if(n-(i*i)<razlika)
        {
            naiblizko=i;
            razlika=n-(i*i);
        }

    }
    k=naiblizko;

    //ostanala

    t=n/k+1;

    char a[k][t];

    int l=0;
    for(int i=0; i<k; i++)
    {
        for(int j=0; j<t; j++)
        {
            if(l<n)
            {
                a[i][j]=getText()[l];
            }
            else
            {
                a[i][j]=' ';
            }
            l++;
        }
    }
    char b[t][k];

    for(int i=0; i<t; i++)
    {
        for(int j=0; j<k; j++)
        {
            b[i][j]=a[j][i];
        }
    }

    for(int i=0; i<t; i++)
    {
        for(int j=0; j<k; j++)
        {

            coded1=coded1+b[i][j];
            setCoded(getCoded()+b[i][j]);
        }

    }


}



The decoding class:
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#include "../include/decoder.h"
#include<iostream>
#include<string.h>
#include <fstream>
using namespace std;

decoder::decoder(string input, string output)
{
    setFileIn(input);
    decode();
    setFileOut(output);
}
void decoder::setFileIn(string filename)
{
    ifstream reader;
    reader.open(filename.data(), ios::in);
    if(reader.is_open())
    {
        reader.seekg(0, ios::end);
        int length = reader.tellg();
        reader.seekg(0, ios::beg);
        char text1[length];
        reader.read(text1, length);
        string result(text1);
        int k = reader.gcount();//?
        result = result.substr(0, k);//?
        reader.close();
        cout<<" rezila: "<<result;
        setCoded(result);
    }
    else
    {
        cout<< "ne  e otvoreno";
    }
}
void decoder::setFileOut(string filename)
{
    ofstream myfile;
    myfile.open(filename.c_str());
    myfile<<getText();
    myfile.close();
}
void decoder:: setCoded(string coded1)
{
    if(coded1!="") coded=coded1;
    else
    {
        cout<<"Kodiraniqt text ne e vuveden pravilno!";
        coded="BLQH";
    }

}
void decoder::setText(string text1)
{
    if(text1!="") text=text1;
    else
    {
        cout<<"Greshka pri kodiraneto!";
        text="BLQH";
    }

}
string decoder:: getText()
{
    return text;
}
string decoder::getCoded()
{
    return coded;
}
void decoder::decode()
{
    string text1;
    int n,k,t;
    n=getCoded().size();
    cout<<getCoded();


    //get nai-blizko

    int  razlika=n-1,naiblizko=1;
    for(int i=2; i<n; i++)
    {
        if(n-(i*i)<0) break;
        //  cout<<endl<<"za i="<<i<<" ee="<<n-(i*i);

        if(n-(i*i)<razlika)
        {
            //    cout<<endl<<"tuk sum";
            naiblizko=i;
            razlika=n-(i*i);
            //  cout<<endl<<"razlikata e"<<razlika;
        }

    }
    k=naiblizko;

    //ostanala

    t=n/k+1;

    //  cout<<"n="<<n<<" k="<<k<<" t="<<t<<endl;


    char a[t][k];

    int l=0;
    for(int i=0; i<t; i++)
    {
        for(int j=0; j<k; j++)
        {
            if(l<n)
            {
                a[i][j]=getCoded()[l];
            }
            else
            {
                a[i][j]=18;
            }
            l++;
        }
    }
    char b[k][t];

    for(int i=0; i<k; i++)
    {
        for(int j=0; j<t; j++)
        {
            b[i][j]=a[j][i];
        }
    }

    for(int i=0; i<k; i++)
    {
        for(int j=0; j<t; j++)
        {
            if(b[i][j]==18) continue;
            //cout<<b[i][j]<<" ";
            text1=text1+b[i][j];

        }

        setText(text1);
    }
}
Last edited on
ne555 (10692)
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int main(int argc, char **argv)
{
   if(argc<4){ //the program name counts as an argument
      usage(); //how they are supposed to use it
      return 1; //error
   }

   string 
      input_filename = argv[2],
      output_filename = argv[3],
      type = argv[1];


Also 
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//coder *c= new coder(filename1,filename2);//leak
coder c(filename1,filename2);
Last edited on
n1xsan (3)
Thanks so much for the help!
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