prikazovy riadok v Dev-C++

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

using std::cout;
using std::cin;

int main()
{
      char prikaz[255];

      while (true) {
            cout << system("cmd");
            cin.getline(prikaz, 255);
            system(cmd);
      }     
      return 0;
}

#include <iostream>
#include <stdlib.h>
#include "stdafx.h"; // ja som to tu musel dat kvoli VS-C++

#include <iostream.h> // ja som to tu musel dat kvoli VS-C++
#include <process.h> // ja som to tu musel dat kvoli VS-C++

int main(int argc, char* argv[])
{
      char prikaz[255];

      while (true) {
            cout << system("cmd");
            cin.getline(prikaz, 255);
            system(prikaz); // <<< tuto bola chyba urcite
      }     
      return 0;
}

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

int main(int argc, char* argv[])
{
char prikaz[255];
while (true)
{
cout << system("cmd");
cin.getline(prikaz, 255);
system(prikaz);
}
return 0;
}

iostream: No such file or directory.
In function `main':
`true' undeclared (first use in this function)
(Each undeclared identifier is reported only once
 for each function it appears in.)
`cout' undeclared (first use in this function)
`cin' undeclared (first use in this function)