Thread: I need help on C++ Uni Project

I have a uni project and i need some help!

i have to develop an MS-DOS command prompt emulations, that has the following dos commands:

CLS
VER
DIR
CD
DOSKEY
HELP
EXIT

ANY IDEAS??
thank u

i really don know how to start...

any tips??

couldnt you use the system("dos command") using a switch statement in dev-c
just a thought, am doing A level computing so im not an expert.

QUESTION:

create one program for each commad? let's say, CD.EXE, DOSKEY.EXE etc?

or create a single program, that reads the input from the user and calls the right fuction for each command, using IF (If input=CLS then ... )

ok done something... check out my code:

Code:

#include <iostream>
#include <stdlib.h>
#include <fstream>
#include <string>

using namespace std;

int main()
{
  string x;
   getline (cin,x);

do{
   if (x=="help")
   {
  string line;
  ifstream myfile ("help.txt"); //Reads the text from a help file
  if (myfile.is_open())
  {
    while (! myfile.eof() )
    {
      getline (myfile,line);
      cout << line << endl;
    }
    myfile.close();
  }
  break;
  
}
   if (x=="cls") //The CLS command, it seems to work fine...
   {      system("CLS");
      break;
   }
   if (x=="ver") //This is the VER command, it displays the version of my program!
   {
                 cout << "Pan O.S. Version 1.0 April 2006 ALL RIGHTS RESERVED\n";
                 }
   break;
}
while (x!="exit"); //done with EXIT command

  cin.get();
  return 0;
}

So far, HELP, CLS, VER and EXIT commands seem to work.
I really need some help on CD and DIR commands. And i have an other problem:

How can i keep the command window open for more than one command? When my program runs, it works only for the first command. It exits when i type the next command.

Thank you

Originally Posted by Salem

The chdir() call is basically your CD command, and a loop calling findfirst / findnext is your DIR command.

Can you explain me this a little more please? I really need some help!

Thank you

Originally Posted by dwks

As for DOSKEY . . . I guess that means you can enter something like "command 1" and it will repeat command 1. You'll need to store the previous commands. Try a vector.

Ok vector it is! so i try this:

Code:

#include <iostream>
#include <stdlib.h>
#include <fstream>
#include <string>
#include <windows.h> 
#include <dir.h>
#include <vector>

using namespace std;
using std::string;

int main()
{
 string x;
 std:: vector <std::string> doskey_vector;
do{   
    
    cout << "OS>";
    getline (cin,x);  
    int j;
    for (j = 0; j < 20; j++)
    doskey_vector.at(j) = x;
...
...

What I did wrong? My program runs, but when i type something, the command window closes.

I want to store let's say, the last 10 commands that the user types, and then use DOSKEY to view them. Any help??


Thank u