What's wrong in this code ? I get [Error] expected class-name before '{' token (Pralka.h line 14 )
i know there are lots of similar questions here. I've googled too but I can't get over it. So I would like to show you my code..
I wrote this very simple code to train myself on inheritance and virtual functions..
main.cpp:
#include <iostream>
#include <fstream>
#include <string>
#include "AGD.h"
using namespace std;
int main() {
Pralka p1("polar", 1250);
AGD *A;
A = &p1;
}
AGD.h:
#ifndef AGD_H
#define AGD_H
#include <iostream>
#include "Pralka.h"
class AGD {
private:
static int liczba_sprzetow;
public:
AGD(){
liczba_sprzetow++;
}
~AGD(){
liczba_sprzetow--;
}
static int get_liczba_sprzetow() {
return liczba_sprzetow;
}
virtual double get_cena() {
}
};
#endif
Pralka.h:
#ifndef PRALKA_H
#define PRALKA_H
#include <iostream>
#include <string>
using namespace std;
class Pralka : public AGD
{
private:
string marka;
double cena;
public:
Pralka(string m, double c): marka(m), cena(c){
}
Pralka(){
}
~Pralka(){
}
string get_marka() const{
return marka;
}
double get_cena() const{
return cena;
}
Pralka& operator=(const Pralka& Q){
marka=Q.marka;
cena=Q.cena;
}
};
#endif
I get also [Error] cannot convert 'Pralka*' to 'AGD*' in assignment but why? I don't understand (main.cpp line 29).
AGD.h is including Pralka.h, but it should be the other way round (Pralka.h should be including AGD.h).
The reason is that Pralka needs to see the AGD declaration to inherit from it. AGD doesn't need to see the Pralka declaration.
Related
Im using vscode and im new to c++. I learned how to create a header file link to its cpp and use it to main.cpp. The only problem bugs me out is why it causes an error this is my simple code.
Name.h
#include <iostream>
#include <string>
class myname
{
public:
void setname(std::string name);
void prname();
private:
std::string Name;
};
Name.cpp
#include "Name.h"
void myname::setname(std::string name)
{
Name = name;
}
void myname::prname()
{
std::cout<<"Hello :"<<Name<<std::endl;
}
Maiin.cpp
#include <iostream>
#include <string>
#include "Name.h"
using std::cout;
using std::string;
using std::endl;
int main()
{
myname Epoy; // IN FUNCTION INT MAIN: ERROR myname was not declared in this scope
Epoy.setname("Jomar"); //note myname <-rename "BUT THIS IS NOT THE ERROR CAUSE THIS JUST HAPPEN BECAUSE OF THE ERROR ABOVE "
Epoy.prname();
return 0;
}
also i tried so many method i even compiled this by using g++ Maiin.cpp Name.cpp - o Maiin
Still didnt work
Edit: Community want me to add more details.
What I asked was, have you write header guards in your header file: #ifndef Name_H, #define Name_H, #endif ? Since you use vscode you have to done it manually.
Like this:
#ifndef Name_H
#define Name_H
#include <iostream>
#include <string>
class myname
{
public:
void setname(std::string name);
void prname();
private:
std::string Name;
};
#endif
you missing a C++ constructor:
class Foo {
public:
Foo() { /* your init code */ } // <-- this is a std. C++ constructor
~Foo() { /* your clean-up code */ } // <-- this is a std. C++ de-structor
};
int main(int argc, char **argv) {
Foo bar; // here, you don't need the: ( ) object on heap !
}
I am new to c++ . The program doesn't compile i am using Xcode. It doesn't give me any error. It just doesn't compile which's weird. Thanks for the help!
I am using 3 files as you can see. I think. there's a problem with the implementation that i can not figure out, if you have any suggestion for a better IDE that Xcode than would be helpful.
Thanks again
Car.cpp
#include <iostream>
#include <string>
#include "Car.h"
using namespace std;
void Car:: setMaker(string m)
{
maker=m;
}
string Car:: getMaker()
{
return maker;
}
void Car:: setModel(int m)
{
model=m;
}
int Car:: getModel()
{
return model;
}
Car.h
#ifndef _CAR_H;
#define _CAR_H;
#pragma once
#include <iostream>
#include <string>
using namespace std;
class Car
{
private:
string maker;
int model;
public:
void setMaker(string m);
string getMaker();
void setModel(int m);
int getModel();
};
#endif
main.cpp
#include <iostream>
#include "Car.cpp"
#include "Car.h"
using namespace std;
int main ()
{
Car c1;
c1.setMaker("BMW");
c1.getMaker();
return 0;
}
I keep getting this error and I am not sure why. I get the error posted in the question title. If I take the semicolon out of the class line I get expected semicolon after class.
#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctime>
#ifndef die_h
#define die_h
using namespace std;
class Dice;
{
private:
int sides;
int value;
public:
Dice(int=6);
void cast();
int getSides();
int getvalue();
return 0;
}
#endif
I'm still a noobie in c++ so I am not to skilled in debugging yet. Just trying to figure out how to fix this compilation error.
CruiseShip.cpp:11: error: expected ‘)’ before ‘n’
CruiseShip.cpp
#include "CruiseShip.h"
#include "Ship.h"
#include <iostream>
using namespace std;
Ship s;
int passengers;
CruiseShip(string n, string y, int p) : Ship(n,y)
{
passengers=p;
}
void print()
{
cout<<"Name: "<<s.getName()<<"\nMaximum passengers:"<<passengers<<endl;
cout<<"-------------------------"<<endl;
}
CruiseShip.h
#ifndef CRUISESHIP_H
#define CRUISESHIP_H
#include "Ship.h"
#include <string>
using namespace std;
//class Ship;
class CruiseShip:public Ship{
private:
int passengers;
Ship::Ship s;
public:
CruiseShip(string, string, int);
virtual void print();
};
#endif
Ship.h
#ifndef SHIP_H
#define SHIP_H
#include <string>
using namespace std;
class Ship{
private:
string name;
string built;
public:
Ship();
Ship(string, string);
string getName();
string getBuilt();
virtual void print();
};
#endif
You have 3 errors:
1 and 2. You don't declare print and CruiseShip (The constructor) as part of the class CruiseShip when you define them. You need to:
CruiseShip::CruiseShip(string n, string y, int p) : Ship(n,y) {
virtual void CruiseShip::print() {
3, you dont have a namespace Ship so this is unnecessary:
Ship::Ship s; // This only needs to be Ship s <- NameSpace::ObjectType nameOfObject;
After this it will compile http://ideone.com/wJ6mPO. It will not link however, because you have undefined references to all of the functions you have yet to define.
I'm new to c++ and I usually can pick through errors and figure out what's wrong but I'm stumped.
I'm getting an error saying "line|10|error: 'string' in class 'mine' does not name a type"
Here is mine.h:
#ifndef MINE_H
#define MINE_H
#include <iostream>
#include <string>
using namespace std;
class mine
{
public:
mine();
string getName();
};
#endif // MINE_H
Here is mine.cpp:
#include "mine.h"
#include <iostream>
#include <string>
using namespace std;
mine::mine()
{
//ctor
}
mine::string getName()
{
}
mine::string getName()
{
}
Should have been
string mine::getName()
{
}
It should be:
string mine::getName()
{
}