Passing an object as argument in c++ - c++

Question

Iam new to c++ trying to learn about namespaces and class.
I have 2 classes here Both are in different files.
The first one is
#include<iostream>
using namespace std;
namespace project{
class Student{
string name,address,enrolmentDate ,usn;
int hours;
public:
Student(char* nusn, char* nname, char* naddress, char* ndate,int nhours){
usn = nusn;
name = nname;
address = naddress;
enrolmentDate = ndate;
hours = nhours;
}
Student(){
getData();
}
void getData(){
std::cout << "Enter Usn,Name,Address,EnrolmentDate,Hours\n";
std::cin >> usn >> name >> address >> enrolmentDate >> hours;
}
string getName(){
return name;
}
string getAddress(){
return address;
}
string getenrolmentDate(){
return enrolmentDate;
}
int getHours(){
return hours;
}
string getUsn(){
return usn;
}
};
}
The Second class is
#include<iostream>
using namespace std;
namespace project{
class CourseRegistration{
string usn, courseId ;
int hours, grade;
public:
CourseRegistration(project::Student obj, string courseId, int nhours, int ngrade){
usn = obj.getUsn();
this->courseId = courseId;
hours = nhours;
grade = ngrade;
}
};
}
The First class Compiles fine.But the second class gives an error.
The error is near that Student Object.
Course.cpp:10:38: error: expected ‘)’ before ‘obj’
CourseRegistration(project::Student obj, string courseId, int nhours, int ngrade){
How Do i Correct It?

Answer 1

I do not see any evidence you've included the definition of Student in "the second file." Your class should be delclared in a header (.h) file with the implementation in a source (.cpp) file. Your compiler is likely complaining because it doesn't know that Student is a class.
Student.h
#include<iostream>
using namespace std;
namespace project {
class Student {
private:
string name,address,enrolmentDate, usn;
int hours;
public:
Student( char*, char*, char*, char*, int );
Student();
void getData();
string getName();
string getAddress();
string getenrolmentDate();
int getHours();
string getUsn();
}
}
Student.cpp
#include "Student.h"
namespace project {
Student::Student( char* nusn, char* nname, char* naddress, char* ndate,int nhours ) {
usn = nusn;
name = nname;
address = naddress;
enrolmentDate = ndate;
hours = nhours;
}
Student() {
getData();
}
void getData() {
std::cout << "Enter Usn,Name,Address,EnrolmentDate,Hours\n";
std::cin >> usn >> name >> address >> enrolmentDate >> hours;
}
string getName() {
return name;
}
string getAddress() {
return address;
}
string getenrolmentDate() {
return enrolmentDate;
}
int getHours() {
return hours;
}
string getUsn() {
return usn;
}
}
CourseRegistration.h
#include "Student.h"
#include<iostream>
using namespace std;
namespace project{
class CourseRegistration {
private:
string usn, courseId ;
int hours, grade;
public:
CourseRegistration( Student, string, int, int );
}
}
CourseRegistration.cpp
#include<CourseRegistration.h>
namespace project {
CourseRegistration::CourseRegistration( Student obj, string courseId, int nhours, int ngrade ) {
usn = obj.getUsn();
this->courseId = courseId;
hours = nhours;
grade = ngrade;
}
}