Segmentation fault

#include <iostream>
 
using namespace std;
 
enum BodyType {NotChosen, Sedan, Hatchback, Limousine};
 
 
class Engine
{
public:
    int power_;
    Engine(): power_(0) {}
    Engine(int value): power_(value) {}
    int GetPower() {return power_;}
};
class Car
{
protected:
    Engine engine;
    const char* mark_;
    int cost_;
public:
    Car(): mark_(nullptr), cost_(0) {}
    Car(int power, int cost, char* strptr): engine(power), mark_(strptr), cost_(cost) {}
    ~Car() {delete mark_;}
    void powerprint()
    {
        cout << "power:     " << engine.power_ << endl;
    }
};
 
class Truck: public Car
{
    BodyType body_;
    int capacity_;
    void checkbodytype()
    {
        switch(body_)
        {
            case 0:
                cout << "Not Chosen" << endl;
                break;
            case 1:
                cout << "Sedan" << endl;
                break;
            case 2:
                cout << "Hatchback" << endl;
                break;
            case 3:
                cout << "Limousine" << endl;
                break;
        }
    }
    void printMark()
    {
        while(mark_)
        {
            cout << *(mark_);
            ++mark_;
        }
        cout << endl;
    }
public:
    Truck(): Car(), body_(NotChosen), capacity_(0) {}
    Truck(int power, int cost, char* strptr, int capacity, BodyType body): Car(power, cost, strptr), body_(body), capacity_(capacity) {}
    ~Truck() {delete [] mark_;}
    void print()
    {
        powerprint();
        cout << "mark:      ";
        printMark();
        cout << "cost:      " << cost_ << endl;
        cout << "capacity:  " << capacity_ << endl;
        cout << "Bodytype:  ";
        checkbodytype();
    }
};
int main()
{
    Truck obj1;
    obj1.print();
    
    Truck obj2(100, 1500, "Reno", 600, Sedan);
    return 0;
};

Car(int power, int cost, char* strptr) : engine(power), mark_(new char[strlen(strptr) + 1]), cost_(cost) { strcpy(mark_, strptr); }