[RESOLVED] Derived class: hot to get mad!!!!
Hi all! I'm trying to get this (i must admit: stupid) program to function properly..but i can't. This is what i get:
Code:
persona.h:12: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
persona.h:12: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
persona.h: In constructor ‘Persona::Persona(char, char, int)’:
persona.h:13: error: invalid conversion from ‘const char’ to ‘const char*’
persona.h:13: error: initializing argument 1 of ‘size_t strlen(const char*)’
persona.h:13: error: invalid conversion from ‘char*’ to ‘char’
persona.h:14: error: invalid conversion from ‘char’ to ‘char*’
persona.h:14: error: initializing argument 1 of ‘char* strcpy(char*, const char*)’
persona.h:14: error: invalid conversion from ‘const char’ to ‘const char*’
persona.h:14: error: initializing argument 2 of ‘char* strcpy(char*, const char*)’
persona.h: In destructor ‘Persona::~Persona()’:
persona.h:20: error: type ‘char’ argument given to ‘delete’, expected pointer
studente.h: At global scope:
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
studente.h: In constructor ‘Studente::Studente(char, int, char, int, int, char)’:
studente.h:11: error: invalid conversion from ‘const char’ to ‘const char*’
studente.h:11: error: initializing argument 1 of ‘size_t strlen(const char*)’
studente.h:12: error: invalid conversion from ‘const char’ to ‘const char*’
studente.h:12: error: initializing argument 2 of ‘char* strcpy(char*, const char*)’
borsista.h: At global scope:
borsista.h:9: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
borsista.h:9: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
borsista.h:9: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
personamain.cpp: In function ‘int main()’:
personamain.cpp:7: error: invalid conversion from ‘const char*’ to ‘char’
personamain.cpp:7: error: initializing argument 1 of ‘Persona::Persona(char, char, int)’
personamain.cpp:7: error: invalid conversion from ‘const char*’ to ‘char’
personamain.cpp:7: error: initializing argument 2 of ‘Persona::Persona(char, char, int)’
personamain.cpp:8: error: invalid conversion from ‘const char*’ to ‘char’
personamain.cpp:8: error: initializing argument 1 of ‘Studente::Studente(char, int, char, int, int, char)’
personamain.cpp:8: error: invalid conversion from ‘const char*’ to ‘int’
personamain.cpp:8: error: initializing argument 2 of ‘Studente::Studente(char, int, char, int, int, char)’
personamain.cpp:8: error: invalid conversion from ‘const char*’ to ‘char’
personamain.cpp:8: error: initializing argument 6 of ‘Studente::Studente(char, int, char, int, int, char)’
personamain.cpp:9: error: invalid conversion from ‘const char*’ to ‘char’
personamain.cpp:9: error: initializing argument 1 of ‘Borsista::Borsista(char, int, char, int, int, char, long int)’
personamain.cpp:9: error: invalid conversion from ‘const char*’ to ‘int’
personamain.cpp:9: error: initializing argument 2 of ‘Borsista::Borsista(char, int, char, int, int, char, long int)’
personamain.cpp:9: error: invalid conversion from ‘const char*’ to ‘char’
personamain.cpp:9: error: initializing argument 6 of ‘Borsista::Borsista(char, int, char, int, int, char, long int)’
persona.h:12: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
persona.h:12: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
persona.h: In constructor ‘Persona::Persona(char, char, int)’:
persona.h:13: error: invalid conversion from ‘const char’ to ‘const char*’
persona.h:13: error: initializing argument 1 of ‘size_t strlen(const char*)’
persona.h:13: error: invalid conversion from ‘char*’ to ‘char’
persona.h:14: error: invalid conversion from ‘char’ to ‘char*’
persona.h:14: error: initializing argument 1 of ‘char* strcpy(char*, const char*)’
persona.h:14: error: invalid conversion from ‘const char’ to ‘const char*’
persona.h:14: error: initializing argument 2 of ‘char* strcpy(char*, const char*)’
persona.h: In destructor ‘Persona::~Persona()’:
persona.h:20: error: type ‘char’ argument given to ‘delete’, expected pointer
persona.h:12: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
persona.h:12: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
persona.h: In constructor ‘Persona::Persona(char, char, int)’:
persona.h:13: error: invalid conversion from ‘const char’ to ‘const char*’
persona.h:13: error: initializing argument 1 of ‘size_t strlen(const char*)’
persona.h:13: error: invalid conversion from ‘char*’ to ‘char’
persona.h:14: error: invalid conversion from ‘char’ to ‘char*’
persona.h:14: error: initializing argument 1 of ‘char* strcpy(char*, const char*)’
persona.h:14: error: invalid conversion from ‘const char’ to ‘const char*’
persona.h:14: error: initializing argument 2 of ‘char* strcpy(char*, const char*)’
persona.h: In destructor ‘Persona::~Persona()’:
persona.h:20: error: type ‘char’ argument given to ‘delete’, expected pointer
studente.h: At global scope:
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
studente.h: In constructor ‘Studente::Studente(char, int, char, int, int, char)’:
studente.h:11: error: invalid conversion from ‘const char’ to ‘const char*’
studente.h:11: error: initializing argument 1 of ‘size_t strlen(const char*)’
studente.h:12: error: invalid conversion from ‘const char’ to ‘const char*’
studente.h:12: error: initializing argument 2 of ‘char* strcpy(char*, const char*)’
persona.h:12: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
persona.h:12: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
persona.h: In constructor ‘Persona::Persona(char, char, int)’:
persona.h:13: error: invalid conversion from ‘const char’ to ‘const char*’
persona.h:13: error: initializing argument 1 of ‘size_t strlen(const char*)’
persona.h:13: error: invalid conversion from ‘char*’ to ‘char’
persona.h:14: error: invalid conversion from ‘char’ to ‘char*’
persona.h:14: error: initializing argument 1 of ‘char* strcpy(char*, const char*)’
persona.h:14: error: invalid conversion from ‘const char’ to ‘const char*’
persona.h:14: error: initializing argument 2 of ‘char* strcpy(char*, const char*)’
persona.h: In destructor ‘Persona::~Persona()’:
persona.h:20: error: type ‘char’ argument given to ‘delete’, expected pointer
studente.h: At global scope:
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
studente.h:10: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
studente.h: In constructor ‘Studente::Studente(char, int, char, int, int, char)’:
studente.h:11: error: invalid conversion from ‘const char’ to ‘const char*’
studente.h:11: error: initializing argument 1 of ‘size_t strlen(const char*)’
studente.h:12: error: invalid conversion from ‘const char’ to ‘const char*’
studente.h:12: error: initializing argument 2 of ‘char* strcpy(char*, const char*)’
borsista.h: At global scope:
borsista.h:9: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
borsista.h:9: error: default argument for parameter of type ‘char’ has type ‘const char [2]’
borsista.h:9: error: default argument for parameter of type ‘char’ has type ‘const char [1]’
The program files are:
persona.h
Code:
//file: persona.h
#ifndef PERSONA_h
#define PERSONA_h
#include<iostream>
#include<string>
using namespace std;
class Persona{
public:
Persona(const char NAME="", char SEX="M",int AGE=0){
nome = new char[strlen(NAME)+1];
strcpy(nome,NAME);
sesso = SEX;
eta = AGE;
}
~Persona() {
cout << "distruttore Persona invocato\n";
delete[] nome;
}
void chisei() {
cout << "sono una Persona di nome " << nome << " ho " << eta << " anni e sono " << sesso << endl;
}
protected:
char *nome;
char sesso;
int eta;
};
#endif
studente.h
Code:
//file studente.h
#ifndef STUDENTE_H
#define STUDENTE_H
#include "persona.h"
class Studente:public Persona{
public:
Studente(const char NAME="", int SEX=0, char AGE="M", int EXAM=0, int MATR=1111111,const char FACULTY=""):Persona(NAME,SEX,AGE){
facolta = new char[strlen(FACULTY)+1];
strcpy(facolta,FACULTY);
esami = EXAM;
matricola = MATR;
}
~Studente() {
cout << "Dealloco Studente...\n";
delete []facolta;
}
void chisei(){
Persona::chisei();
cout << "In più sono uno studente di " << facolta << " matricola " << matricola << " e " << esami << " esami\n";
}
protected:
int esami;
int matricola;
char *facolta;
};
#endif
borsista.h
Code:
//file borsista.h
#ifndef BORSISTA_H
#define BORSISTA_H
#include "studente.h"
class Borsista:public Studente{
public:
Borsista(const char NAME="", int SEX=0, char AGE="M", int EXAM=0, int MATR=1111111,const char FACULTY="", long BAG=0):Studente(NAME,FACULTY,AGE,SEX,EXAM,MATR){
borsa = BAG;
}
~Borsista(){
cout << "dealloco borsista\n";
}
void chisei(){
Studente::chisei();
cout << " e sono anche un borsista, con una borsa di " << borsa << endl;
}
protected:
long borsa;
};
#endif
personamain.cpp
Code:
#include <iostream>
#include "borsista.h"
using namespace std;
int main() {
Persona primo("Giorgio","M",15);
Studente secondo("Valeria","F",20,5,121232,"Storia");
Borsista terzo("giustino","M",22,9,123424,"Ingegneria");
primo.chisei();
secondo.chisei();
terzo.chisei();
return 0;
}
Please help me!!!!! :AAAAAAAAAAAAA
Re: Derived class: hot to get mad!!!!
Hi,
I think there are more errors, but in persona.h you missed the '*' in constructor when you declare strings (char pointers and not only char, or use string class from STL), ie:
Code:
Persona(const char *NAME="", char *SEX="M",int AGE=0){
I guess, watching your error messages, there are other mistakes like this. Check it out!!!!
By the way, it's not usual to use variables with all capital letters, they're usually reserved for macros.
Albert.
Re: Derived class: hot to get mad!!!!
I would strongly recommend that you use std::string rather than char arrays because std::string takes care of its memory allocating/freeing automatically.
Re: Derived class: hot to get mad!!!!
Really Thanks men! I just relaxed a bit, returned to screen and seen so many distraction errors that my prof would kill me at the exam!! Now things function properly!
@Zaccheus
I know, but this is an exam, and i have to use both of them!
Regards
