#include <iostream>
using namespace std;
class students {
public:
students(); //default constructor
students(const students & s1); //copy constructor
void setScore(double p) { score = p; } //score setter
students operator+(const students & s2) const; //define students + students
private:
double score; //the score variable
};
int main() {
cout << "omidh object ";
students omidh;
cout << "negin object ";
students negin;
negin.setScore(2.0);
omidh.setScore(3.0);
cout << "total object ";
students total = omidh + negin;
}
students students::operator+(const students & s2) const {
cout << "s3 object ";
students s3;
s3.score = score + s2.score;
return s3;
}
students::students() {
cout << " used default constructor\n";
}
students::students(const students & s1) {
cout << " used copy constructor\n";
}
Here is a simple class, the objects "omidh", "negin" and "s3" invoked default constructor but I don't know what constructor does "total" invokes. It supposed to invoke a copy constructor because I returned a student object as the return type for operator overload. However it works fine and assigned s3 to total.
Program outputs:
omidh object used default constructor
negin object used default constructor
total object s3 object used default constructor
