how to pass values for the base class constructor in the inherited constructor

Question

I have to classes car and vehicle I am trying to use parametrized constructor to set values for the Car object members but it gives errors

#include <iostream>
#include <string>
class vehicle {
    int wheels ;
    double price ;
    std::string color ;
    
public:
    vehicle(int , double , std::string ) ;
    void initialize (int , double , std::string ) ;
    ~vehicle (void) ;
};

class car : public vehicle {
    int load ;
    double weight ;
    
public:
    car (int , double  , int wheels , double price , std::string color ) ;
    void initialize (int , double , std::string , int , double ) ;
    ~car (void) ;
};
car::car(int load , double weight , int wheels , double price , std::string color ):  vehicle (wheels ,price , color )
{
    this->load = load ;
    this->weight = weight ;
}
vehicle::vehicle(int w,double p,std::string c)
{
    initialize(w,p,c);
}
void vehicle::initialize(int w,double p,std::string c)
{
    wheels = w;
    price = p;
    color = c;
}

it gives an error in the car Constructor line

Answer 1

You have to explicitly call your base constructor and with constructor initializer list you can greatly simplify your code:

#include <string>
class vehicle {
    int wheels ;
    double price ;
    std::string color ;
    
public:
    vehicle(int wheels, double price, std::string color) : 
        wheels(wheels), price(price), color(color){}
};

class car : public vehicle {
    int load ;
    double weight ;
    
public:
    car (int load, double weight , int wheels, double price, std::string color ) : 
        vehicle(wheels, price, color), load(load), weight(weight){}
};

int main() {
    car c(4, 1500, 4, 36000, "white");
}