I wrote a program with classes. When in one file it works fine. But when i split them up into three the main program won't read the other two WHY?

.H FILE

// FILE w.h


#ifndef LUNAR_LANDER
#define LUNAR_LANDER

class lunar_lander
{
public:
       
   lunar_lander(float);//, float, float, float, float, float, float);
   
    // ALTITUDE AND ACCESSOR
   float alt(float, float, float);
   void setalt(float alt);
   const float getalt();

   // VERTICAL SPEED AND ACCESSOR
   float vvel(float, float, float);
   
   // FUEL IN TANK AND ACCESSOR
   float tankf();
   
   // FUEL FLOW RATE AND ACCESSOR
   float frate(float);
   void frate();
        
   // LANDER MASS AND ACCESSOR
   float massl();
   
   // LANDER THRUST AND ACCESSOR
   float thrust();

   // MAX FUEL CONSUMPTION RATE AND ACCESSOR
   float fuelconsum(float , float , float );
   
   // WHEN LUNAR LANDS
   int landed();
     
   // TIME
   float time(float);
   void time();
   
private:
        
   float alt_;
   int count;
   float vvel_;
   float tankf_;
   float frate_;
   float fuelconsum_;
   float thrust_;
   float massl_;
   float time_;
};

#endif

IMPLEMENTATION FILE

#include "56.h"
#include <iostream>
#include <climits>
using namespace std;   
   
lunar_lander::lunar_lander(float a) //float fl, float vs, float t, 
//float fr, float thr, float ml)
{
   alt_ = a;
  // vvel_ = vs; 
  // fuelconsum_ = fl;
  // time_ = t ;
  // frate_ = fr;
  // thrust_ = thr;
   //massl_ = ml;
   
   //fr = t* frate_ * fl;
}
// ALTITUDE OF THE LUNAR LANDER
float lunar_lander::alt(float a, float vs, float t)
{
      alt_ = a;
      vvel_ = vs; 
      time_=t;
      a = t * vs;
      return a;
       }
// VERTICAL VELOCITY
float lunar_lander::vvel(float t, float ml, float thr)
{
      time_ = t;
      thrust_ = thr;
      massl_ = ml;
       return    t * ( thr/ml - 1.62); 
       }
// FUEL CONSUMPTION
float lunar_lander::fuelconsum( float t, float fr, float ml) 
{
       time_ = t;
      fuelconsum_ = fr;
      massl_ = ml;
      t * fr * ml;
       return t * fr * ml;;
       }
// MASS OF THE LUNAR_LANDER W/0 FUEL
float lunar_lander::massl() 
{
      return massl_;
      }
// INTIAL SPEED OF THE LUNAR_LANDER      
float lunar_lander::thrust() 
{
      return thrust_;
      }
      
// CORRECTS FRATE IF TANKS IS EMPTY
float lunar_lander::frate(float tankf)
{
      if(tankf = 0)
      {
                    frate_ = 0;
                    }
      return frate_;
      }
// CHECKS IF TANK IS FULL OF FUEL
float lunar_lander::tankf()
{
      return tankf_;
      }  
// TELLS IF THE LANDER HAS LANDED
int lunar_lander::landed()
{
   if (alt_<=0)
      return 1;
   return 0;
}
// CORRECTS IF TIME GOES BELOW ZERO
float lunar_lander::time(float q)
{
    time_ = 0.0;
    time_ ++;
    if (time_ <= 0.0)
    {
             time_ = 0.0;
             }
}

// FUEL RATE
void lunar_lander::frate()
{
   for(float i = 0.0; i < 1.0; ++i)
     frate_++;
     }
     
// MUTATOR THAT ALLOWS TIME TO PASS
void lunar_lander::time()
{
     for(float z = 0.0; z < INT_MAX; ++z)
     time_++;
     }
const float lunar_lander::getalt()
{
     return alt_;
     }
void lunar_lander::setalt(float alt)
{
     if(alt >0 && alt <INT_MAX)
     {
            alt = alt_;
            }
     else
     cerr << "What" << endl;
     }
   float thrust = 5000;
   float alt = 1000;
   float frate = 0;
   float vvel_ = 0;
   float tankf = 1700;
   const float massl = 900;
   const float fuelconsum = 10;
   const float gravity = 1.62;

MAIN PROGRAM

#include "56.h"
#include "56.cpp"
#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    lunar_lander y(14);
    y.setalt(15);
    cout << y.getalt() << endl;
    getch();
}

THE MAIN won't read from the first two, but the implemention file will read from the 56.h.?

never ever include one *.cpp file inside another one. #include's are only for header files with *.h extension and often with no extension at all. If your program consists of two or more *.cpp files then each file should be compiled as a distinct unit then finally all object files and libraries are linked together. How exactly to do that depends on the compiler you are using -- each compiler does this differently.

O.k i understand. I am using Devx. Compiler do you have any idea how i should link the files together?

>I am using Devx. Compiler do you have any idea how i should link the files together?
There's an "add source file to project" button or something similar to that (been quite a while since I used Dev). Once the CPP files are added, everything should work as expected.

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