First of all, thanks for trying to answer my question.
I am working on a lunar lander class and I have written most of its header file and its implementation(.cpp). I also wrote a extremely simple driver program that tests the class but I encounter a problem that I can't solve on my own.
When I try to compile, an error message comes up saying, "left of '.get_crt_alt' must have class/struct/union."
In order, below are the driver program, header file, and the implementation of class Lander. Please take a look at them and help me if you can!
CODE
// FILE: main.cpp
// MAIN PROGRAM OF THE LUNAR LANDER GAME THAT USES CLASS Lander
#include "Lander.h"
#include <iostream>
using namespace std;
int main()
{
Lander myLander(float, float, float, float, float, float, float);
cout << myLander.get_crt_alt();
return 0;
}
CODE
// FILE: Lander.h
// HEADER FILE FOR CLASS Lander
#ifndef LANDER_H
#define LANDER_H
const float SRATE = 0; // DEFAULT STARTING FUEL FLOW RATE (AS A FRACTION OF THE MAXIMUM FUEL CONSUMPTION RATE)
const float SVSPEED = 0; // DEFAULT VERTICAL SPEED
const float SALT = 1000; // DEFAULT STARTING ALTITUDE
const float SFUELAMOUNT = 1700; // DEFAULT STARTING FULE AMOUNT
const float LANDERMASS = 900; // DEFAULT LANDER MASS
const float MAXTHRUST = 5000; // DEFAULT MAXIMUM ENGINE THRUST
const float MAXRATE = 10; // DEFAULT MAXIMUM FUEL CONSUMPTION RATE
class Lander
{
public:
// CONSTRUCTORS
Lander(float, float, float, float, float, float, float);
// ACCESSOR FUNCTIONS
float get_crt_rt() const; // GET CURRENT FUEL FLOW RATE
float get_crt_vs() const; // GET CURRENT VERTICAL SPEED
float get_crt_alt() const; // GET CURRENT ALTITUDE
float get_crt_am() const; // GET CURRENT FUEL AMOUNT
float get_crt_ms() const; // GET CURRENT LANDER MASS
float get_max_ts() const; // GET MAXIMUM ENGINE THRUST
float get_max_rt() const; // GET MAXIMUM FUEL FLOW RATE
// MUTATOR FUNCTIONS
void time(float); // TIME PASSAGE FUNCTION THAT UPDATES THE VALUES OF crt_rt, crt_vs, crt_alt, crt_am
void chgflow(float); // FUNCTION THAT
private:
// DATA MEMBERS
float crt_rt; // CURRENT FUEL FLOW RATE
float crt_vs; // CURRENT VERTICAL SPEED
float crt_alt; // CURRENT ALTITUDE
float crt_am; // CURRENT FUEL AMOUNT
float crt_ms; // CURRNET LANDER MASS
float max_ts; // MAXIMUM ENGINE THRUST
float max_rt; // MAXIMUM FUEL FLOW RATE
};
#endif // LANDER_H
CODE
// FILE: Lander.cpp
// IMPLEMENTATION FOR CLASS Lander
#include "Lander.h"
#include <iostream>
using namespace std;
Lander::Lander(float crt_rt, float crt_vs, float crt_alt, float crt_am, float crt_ms, float max_ts, float max_rt )
{
crt_rt = SRATE;
crt_vs = SVSPEED;
crt_alt = SALT;
crt_am = SFUELAMOUNT;
crt_ms = LANDERMASS;
max_ts = MAXTHRUST;
max_rt = MAXRATE;
}
float Lander::get_crt_rt() const
{
return crt_rt;
}
float Lander::get_crt_vs() const
{
return crt_vs;
}
float Lander::get_crt_alt() const
{
return crt_alt;
}
float Lander::get_crt_am() const
{
return crt_am;
}
float Lander::get_crt_ms() const
{
return crt_ms;
}
float Lander::get_max_rt() const
{
return max_rt;
}
float Lander::get_max_ts() const
{
return max_ts;
}
void Lander::time(float t)
{
// 1. IF OUT OF FUEL, CHECK THROTTLE/ if(crt_am = 0)................
// 2. CHANGE VELOCITY/ crt_vs +=
// 3. CHANGE ALTITUDE/ crt_alt -=
// 4. REDUCE REMAINING FUEL / crt_am -=
// 5. IF THE ALTITUDE < 0, SET TO ZERO/ if(crt_alt <0)/ crt_alt = 0
// 6. IF OUT OF FUEL, SET TO ZERO/ if(crt_am < 0)/ crt_am = 0
}
void Lander::chgflow(float f)
{
crt_rt = f;
}
4 Dec, 2007 - 01:38 PM
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