using namespaces to access classes that are in separate files

[Hotice]

Let's say you have a main() file, 8 separate cpp files, and 8 corresponding header files (that represent classes, of course) Is it possible to assign each cpp file a different namespace, say namespace na for class a, and then namespace nb for class b, and so on?

[hamsterman]

Sure, why not?

[Hotice]

would you then just make instances of the class, and the functions to be called, inside the namespaces?

[hanst99]

No, you can still create instances of the class outside the namespace, just the class and function declarations would have to be in the namespace.

[Hotice]

What I am trying to do is this:

#include <iostream>
#include <fstream>
#include <sstream>
#include <new>
#include <math.h>
#include <time.h>
#define g 9.8
#include "include/intro.h"
#include "include/Labone.h"

using namespace std;
Labone e [5];     //Getting ready to make 5 instances of the class Labone
//Setting all elements of the array to instances...
for (int n = 0; n<5;n++)
{
    e[n] = Labone(n);
}   //end initializer
namespace na
{
    e[0].etitlea();
    for (int nu = 0; nu<5;nu++)
    {
        e[nu].adata(nu);
    }   //end data handler a
    e[0].etitleb();
    for (int num = 0; num<5; num++)
    {
        e[num].getaccel();
        e[num].bdata(num);
        e[num].setaccel();
    }   //end data handler b
    e[0].analysis();
}   //end namespace

int main()
{
    int x;
    string mystr;
    cout << "Welcome to the Physics Lab Program!"<<endl;
    cout<<'\n'<<"The labs for this course that there are programs for are as follows: "<<endl;
    cout<<'\n'<<"1 - 1D Kinematics"<<endl;
    cout<<"3 - Newton's Laws"<<endl;
    cout<<"4 - Friction"<<endl;
    cout<<"5 - Work and Energy"<<endl;
    cout<<"6 - Collisions"<<endl;
    cout<<"7 - Torque"<<endl;
    cout<<"8 - Simple Harmonic Motion"<<endl;
    cout<<"9 - Fluids"<<endl;
    cout<<'\n'<<"Please make your selection: ";
    getline(cin,mystr);
    stringstream(mystr)>>x;
    return 0;
}  //end main 

I am trying to call the class Labone (and its functions) how I normally would if this were one file, when the user inputs 1.

[hanst99]

You know... you have a using namespace std; there right? What do you think that does? I think you should read something about namespaces somewhere.

[Hotice]

I know that's the case, and I know that is the standard namespace, which is associated with entities created with iostream. I am trying to use different namespaces to handle any problems with coincidence of variable names. I am trying to do something like what is shown here, but with classes: http://www.cplusplus.com/doc/tutorial/namespaces/

[ModShop]

Just put your class definitions from your headers inside a namespace.

namespace physX
{
    class Whatever
    {
        //define class as normal
    };
}

Then class Whatever would be accessed as physX::Whatever in other parts of the code, unless you have using namespace physX; somewhere.

[Hotice]

It doesn't generate any compile errors! At least none concerning this. It is, however, generating errors as to the empty files I have, and simply "complains all the way down" after I remove them from the project. Why is this? Better yet, never mind. I have decided not to use different namespaces for different classes. The variables are all private (last time I checked), so there is no need!

[ModShop]

Maybe you forgot a bracket somewhere? Or don't have include guards on your header files. Its hard to say what the problem is without any code.

[Hotice]

I am now trying to put them all into one big program, which has been done for the most part (on every program except the final version of the one I was creating in this thread; this one isn't included because I am trying to make its data depend less on intro(), a common class for all the other programs. I am trying to do this while maintaining structure.) Here is my .cpp file (sorry for posting the entire file):

#include <iostream>
#include <fstream>
#include <sstream>
#include <new>
#include <math.h>
#include <time.h>
#define g 9.8
#include "include/intro.h"
#include "include/Labone.h"
#include "include/Labthree.h"
#include "include/Labfour.h"
#include "include/Labfive.h"
#include "include/Labsix.h"
#include "include/Labseven.h"
#include "include/Labeight.h"
#include "include/Labnine.h"

using namespace std;

int main()
{

    int x;
    string mystr;
    cout << "Welcome to the Physics Lab Program!"<<endl;
    cout<<'\n'<<"The labs for this course that there are programs for are as follows: "<<endl;
    cout<<'\n'<<"1 - 1D Kinematics"<<endl;
    cout<<"3 - Newton's Laws"<<endl;
    cout<<"4 - Friction"<<endl;
    cout<<"5 - Work and Energy"<<endl;
    cout<<"6 - Collisions"<<endl;
    cout<<"7 - Torque"<<endl;
    cout<<"8 - Simple Harmonic Motion"<<endl;
    cout<<"9 - Fluids"<<endl;
    cout<<'\n'<<"Please make your selection: ";
    getline(cin,mystr);
    stringstream(mystr)>>x;

    //intro i;
    intro i(x);
    i.names();

    if (x==1)
    {
        Labone o [5];     //Getting ready to make 5 instances of the class Labone
        //Setting all elements of the array to instances...
        for (int n = 0; n<5;n++)
        {
            o[n] = Labone(n);
        }   //end initializer
        o[0].etitlea();
        for (int nu = 0; nu<5;nu++)
        {
            o[nu].adata(nu);
        }   //end data handler a
        o[0].etitleb();
        for (int num = 0; num<5; num++)
        {
            o[num].getaccel();
            o[num].bdata(num);
            o[num].setaccel();
        }   //end data handler b
        o[0].analysis();
    }   //end if
    else if(x==3)
    {
        Labthree e (1);
        e.titleone(1);
        e.tabledata();
        Labthree exp (2);
        exp.titleone(2);
        exp.tabledata();
        exp.analysis();
    }   //end case 3
    else if(x==4)
    {
        Labfour f;
        f.reminder();
        f.partone();
        f.parttwo();
        f.printtables();
        f.partthree();
        f.analysis();
    }   //end case 4
    else if (x==5)
    {
        Labfive w;
        w.partone();
        w.parttwo();
        w.partthree();
        w.analysis();
    }   //end case 5
    else if (x==6)
    {
        string dum;
        float d,g;
        cout<<"Enter the mass of cart 1 (in kilograms): ";
        getline(cin,dum);
        stringstream(dum)>>d;
        cout<<"Enter the mass of cart 2 (in kilograms): ";
        getline(cin,dum);
        stringstream(dum)>>g;
        Labsix ex[6];
        for (int entry = 0;entry<6;entry++)
        {
            //calling everything...
            ex[entry] = Labsix(entry,d,g);
            ex[entry].udothis();
            ex[entry].arraysetter();
        }   //end for
        ex[0].printstart();
        for (int turn = 0; turn<6;turn++)
        {
            ex[turn].printdataa();
        }   //end for
        ex[1].printstart();
        for (int row = 0;row<6;row++)
        {
            ex[row].printdatab();
        }   //end for
        ex[2].printstart();
        for (int rowtwo = 0;rowtwo<6;rowtwo++)
        {
            ex[rowtwo].printdatac();
        }   //end for
        ex[0].analysis();
    }   //end case 6
    else if (x==7)
    {

    }   //end case 7
    else if (x==8)
    {
        Labeight l[10];
        //initializing all instances...
        for (int val= 0;val<10;val++)
        {
            l[val] = Labeight(val);
        }   //end for
        l[0].ttitle();
        for (int v = 0; v<10;v++)
        {
            l[v].tabledata();
        }   //end for
        l[0].analysisone();
        l[0].xlstitle();
        for (int va = 0; va<10;va++)
        {
            l[va].newrows();
        }   //end for
        l[0].analysistwo();
        l[0].ecalc();
    }   //end case 8
    else if (x==9)
    {
        Labnine n;
        n.partone();
        n.parttwo();
        n.analysis();
    }   //end case 9
    else
    {

    }   //end else
    return 0;
}   //end main 

It's giving me errors like :

line 96:Expected unqualified-id before numeric constant; line 102: no match for operator>> 

I think my error stems from the fact that I don't know how to properly make and use a makefile (I am using Code::Blocks and running Windows).