Inheritance

Question

Why this program don’t print out on the screen variables name and course when we use constructor?

#include <iostream>
#include <string>
using namespace std;
class Stu{
string name, course;
public:
Stu() {}
Stu(string name, string course) { //parameterised consturctor
this->name = name;
this->course = course;
}

void showstud() {
cout << "Name" << name << endl;
cout << "Course " << course << endl;
}
};
class marks :public Stu {
int m, p, c;
public:
marks(string name, string course,int m ,int p,int c) {
Stu(name, course);
this->m = m;
this->p = p;
this->c = c;

}
void showmarks() {
cout << m << endl << p << endl<< c << endl;
}
};

void main() {
marks ma("Ram", "Jam", 3, 4, 5);
ma.showstud();
ma.showmarks();

}

Answer 1

thank you sooo much !!

Answer 2

the call of the base class constructor must be in the initializer-list of the constructor of the subclass:

class marks :public Stu {
public:
marks(string name, string course,int m ,int p,int c)
: Stu(name, course)
{ /* ......*/ }
// .......
};

https://code.sololearn.com/c1lDSzhwN9nF/#cpp

tip: base-class constructors that take arguments have to be called there before any members are initialized of sub-class