If you're coder helper, then help me😊

Question

#include <iostream>
#include <vector>
using namespace std;

class Number{
public:
int setNumber(){
cin >> num;
return num;
}

friend void infoStreamer(Number *obj);

protected:
int num;

};

class CubeNumber : public Number{
public:
int cubeNumber (){
cNum = num*num*num;
return cNum;
}
private:
int cNum;
};

void infoStreamer(Number *obj){
cout << "Your input: " << obj->setNumber();
}

int main() {
Number *n;
CubeNumber *cn;

n->setNumber();
infoStreamer(n);

return 0;
}
Must outputs something, but it doesn't🤔

Answer 1

You have declared pointer n to Number, but don't allocated memory by new Number().
Now you have a pointer to the unknown

Answer 2

Oleg Storm you are not doing allocation of Number class pointer.. Just do it as below:

Number* n = new Number;

Or

Number a;
Number* p = &a;