invalid conversion from `unsigned int' to `const char*'
hey guys....can anyone help me with this?
here is the full code...
#include "Student.h"
#include <fstream>//gia leitourgies eisodou eksodou se arxeia
#include <string>
#include <iostream>// parexei uposthriksh sto susthma eisodou/eksodou
#include <sstream>//to define several template classes that support
//iostreams operations on sequences stored in an allocated array object
#include <stdlib.h>//has got functions involving memory allocation, process control, conversions and others
using namespace std;
//Kataskeuasths
Student::Student(const string& id, const string& name, unsigned courses)
{ this -> id = "";
this -> name = "";
numOfcourses = courses;
grades = new float[numOfcourses];
cid = new string[numOfcourses];
for( int i = 0; i < courses; i++ ){
grades[i] = 0;
cid[i] = "";
}
}
//Kataskeuasths antigrafou
Student::Student(const Student& original)
{
numOfcourses=original.numOfcourses;
//desmeuetai mnhmh ston eleuthero xwro
grades = new float [numOfcourses];
cid = new string [numOfcourses];
//apodidetai h timh sth nea thesh mnhmhs
for(unsigned i=0;i<numOfcourses;i++)
{
grades[i]=original.grades[i];
cid[i]=original.cid[i];
}
}
//Katastrofeas
//diagrafoume o,ti exoume dhmiourgisei me new
Student::~Student()
{
// cout<<"deleting"<<endl;
delete []grades;
delete []cid;
}
//Apothikeuei sthn (i+1)-osth 8esh to (i+1)osto
//antika8istoume to id ths ekfwnhshs me ccode gia na mhn to mperdepsoume me to id tou foithth
void Student:: setCourse(unsigned i, const string& ccode)
{
cid[i+1] = ccode;
}
//Apothikeuei thn vathmologia sto (i+1)-osto ma8hma
void Student:: setGrade(unsigned i, float g)
{
grades[i+1]= g;
}
//Yperfortwsh telesth =
Student& Student::operator=(const Student& right)
{
if(this==&right) return *this;
//to right mporei na exei diko tou arithmo numOfcourses, allo grades kai cid
delete []grades;
delete []cid;
numOfcourses=right.numOfcourses;
grades=new float[numOfcourses];
cid= new string[numOfcourses];
for(unsigned i=0;i<numOfcourses;i++)
{
grades[i]=right.grades[i];
cid[i]=right.cid[i];
}
return *this;
}
float Student:: getGradeAvg() const
{ float sum=0;
unsigned perasmena=0;
float avg=0;
for(unsigned i=0; i<=numOfcourses; i++)
{ if (grades[i]>=5)
{sum = sum+grades[i];
perasmena++;
}
}//for
if (perasmena != 0)
{avg=sum/perasmena;}
else cout<<"O foithts den exei epityxei se kanena ma8hma, Mesos Oros=0"<<endl;
return avg;
}
//Yperfortwsh telesth <<
ostream& operator<<(ostream& out,const Student& s)
{
//stelnei sto out ton kwdiko tou foithth kai to onoma
out<<"<student id="""<<s.id<<""" name="""<<s.name<<""" courses="""<<s.numOfcourses<<"""\">"<<endl;
//stelnei sto out tous vathmous kai tous kwdikous stwn ma8hmatwn
for (unsigned i=0; i<=s.numOfcourses; i++)
{ out<<"<course grade="""<<s.grades[i]<<"""\">"<<" "<<s.cid[i]<<" </course>"<<endl;
}//for
out<<"</student>"<<endl;
//epistrefei sto programma to out
return out;
}
//Yperfortwsh telesth >>
istream& operator>>(istream& in,Student& s)
{
string word;
bool telos=false;
//oso diavazei lekseis apo to reuma in
while(in>>word && telos==false)
{
//an h leksh pou diavazei einai h "<student" tote apothikeueuei ena-ena ta xarakthristika tou foithth
if(word=="<student")
{
//paei sthn epomenh leksh h opoia einai to id="
in>>word;
//diaxwrizei tous xarakthres etsi wste na parei th leksh pou antistoixei sto id tou foithth
string str(word.begin()+4,word.end()-1);
s.id=str;
//paei sthn epomenh leksh h opoia einai to " name="
in>>word;
string str1(word.begin()+6,word.end()-1);
s.name=str1;
//paei sthn epomenh leksh h opoia einai to " courses="
in>>word;
string str2(word.begin()+9,word.end()-1);
//metatrepei to string se int me thn synarthsh atoi
unsigned number = atoi(str2.c_str());
s.numOfcourses=number;
Student s2(s.numOfcourses);
s=s2;
telos=true;
}
}
string pedio;
unsigned i=0;
while(in>>pedio && pedio!="</student>")
{
if(pedio=="<course")
{
in>>pedio;
string str3(pedio.begin()+7,pedio.end()-1);
double Gr = atof(str3.c_str());//PROSOXH!!!!!!!!!!! TO ATOI METATREPEI SE INTEGER KI EGW 8ELW FLOAT!!!!!!
s.grades[i] = Gr;
in>>pedio;
string str4(pedio.begin()+2,pedio.end()-2);
string Cid = pedio;
s.cid[i] = Cid;
i++;
}
}
return in;
}//Student.cpp
here is the full code...
#include "Student.h"
#include <fstream>//gia leitourgies eisodou eksodou se arxeia
#include <string>
#include <iostream>// parexei uposthriksh sto susthma eisodou/eksodou
#include <sstream>//to define several template classes that support
//iostreams operations on sequences stored in an allocated array object
#include <stdlib.h>//has got functions involving memory allocation, process control, conversions and others
using namespace std;
//Kataskeuasths
Student::Student(const string& id, const string& name, unsigned courses)
{ this -> id = "";
this -> name = "";
numOfcourses = courses;
grades = new float[numOfcourses];
cid = new string[numOfcourses];
for( int i = 0; i < courses; i++ ){
grades[i] = 0;
cid[i] = "";
}
}
//Kataskeuasths antigrafou
Student::Student(const Student& original)
{
numOfcourses=original.numOfcourses;
//desmeuetai mnhmh ston eleuthero xwro
grades = new float [numOfcourses];
cid = new string [numOfcourses];
//apodidetai h timh sth nea thesh mnhmhs
for(unsigned i=0;i<numOfcourses;i++)
{
grades[i]=original.grades[i];
cid[i]=original.cid[i];
}
}
//Katastrofeas
//diagrafoume o,ti exoume dhmiourgisei me new
Student::~Student()
{
// cout<<"deleting"<<endl;
delete []grades;
delete []cid;
}
//Apothikeuei sthn (i+1)-osth 8esh to (i+1)osto
//antika8istoume to id ths ekfwnhshs me ccode gia na mhn to mperdepsoume me to id tou foithth
void Student:: setCourse(unsigned i, const string& ccode)
{
cid[i+1] = ccode;
}
//Apothikeuei thn vathmologia sto (i+1)-osto ma8hma
void Student:: setGrade(unsigned i, float g)
{
grades[i+1]= g;
}
//Yperfortwsh telesth =
Student& Student::operator=(const Student& right)
{
if(this==&right) return *this;
//to right mporei na exei diko tou arithmo numOfcourses, allo grades kai cid
delete []grades;
delete []cid;
numOfcourses=right.numOfcourses;
grades=new float[numOfcourses];
cid= new string[numOfcourses];
for(unsigned i=0;i<numOfcourses;i++)
{
grades[i]=right.grades[i];
cid[i]=right.cid[i];
}
return *this;
}
float Student:: getGradeAvg() const
{ float sum=0;
unsigned perasmena=0;
float avg=0;
for(unsigned i=0; i<=numOfcourses; i++)
{ if (grades[i]>=5)
{sum = sum+grades[i];
perasmena++;
}
}//for
if (perasmena != 0)
{avg=sum/perasmena;}
else cout<<"O foithts den exei epityxei se kanena ma8hma, Mesos Oros=0"<<endl;
return avg;
}
//Yperfortwsh telesth <<
ostream& operator<<(ostream& out,const Student& s)
{
//stelnei sto out ton kwdiko tou foithth kai to onoma
out<<"<student id="""<<s.id<<""" name="""<<s.name<<""" courses="""<<s.numOfcourses<<"""\">"<<endl;
//stelnei sto out tous vathmous kai tous kwdikous stwn ma8hmatwn
for (unsigned i=0; i<=s.numOfcourses; i++)
{ out<<"<course grade="""<<s.grades[i]<<"""\">"<<" "<<s.cid[i]<<" </course>"<<endl;
}//for
out<<"</student>"<<endl;
//epistrefei sto programma to out
return out;
}
//Yperfortwsh telesth >>
istream& operator>>(istream& in,Student& s)
{
string word;
bool telos=false;
//oso diavazei lekseis apo to reuma in
while(in>>word && telos==false)
{
//an h leksh pou diavazei einai h "<student" tote apothikeueuei ena-ena ta xarakthristika tou foithth
if(word=="<student")
{
//paei sthn epomenh leksh h opoia einai to id="
in>>word;
//diaxwrizei tous xarakthres etsi wste na parei th leksh pou antistoixei sto id tou foithth
string str(word.begin()+4,word.end()-1);
s.id=str;
//paei sthn epomenh leksh h opoia einai to " name="
in>>word;
string str1(word.begin()+6,word.end()-1);
s.name=str1;
//paei sthn epomenh leksh h opoia einai to " courses="
in>>word;
string str2(word.begin()+9,word.end()-1);
//metatrepei to string se int me thn synarthsh atoi
unsigned number = atoi(str2.c_str());
s.numOfcourses=number;
Student s2(s.numOfcourses);
s=s2;
telos=true;
}
}
string pedio;
unsigned i=0;
while(in>>pedio && pedio!="</student>")
{
if(pedio=="<course")
{
in>>pedio;
string str3(pedio.begin()+7,pedio.end()-1);
double Gr = atof(str3.c_str());//PROSOXH!!!!!!!!!!! TO ATOI METATREPEI SE INTEGER KI EGW 8ELW FLOAT!!!!!!
s.grades[i] = Gr;
in>>pedio;
string str4(pedio.begin()+2,pedio.end()-2);
string Cid = pedio;
s.cid[i] = Cid;
i++;
}
}
return in;
}//Student.cpp
please use [ code ] [ /code ] tags, and tell us where the error occurs.
Also, would be nice if the comments were in english.
Also, would be nice if the comments were in english.
|
|
well the problem occurs in line 143 and it says "invalid conversion from `unsigned int' to `const char*'"
I don't see why it gives you exactly that error message, but at line 143 you call the Student constructor Student(unsigned int) - And I don't see where you defined that one.
Topic archived. No new replies allowed.