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Changing the value of a member variable.

CPPrangernoob55 (2)
The instructions that I'm provided direct me to set the speed member variable as 0 within the constructor. If that is the case, how can I change that value from 0 to anything else within my calcAccel function? Basically I want to add five to the speed every time the calcAccel function is called.

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#include <string>
using namespace std;

class Car
{
	private:
		int yearModel;
		int speed;
		string make;
	public:
		Car (int,string);
		void setYearModel(int);
		void setMake(string);
		void setSpeed(int);
		int getYearModel() const;
		int getSpeed() const;
		string getMake() const;
		int calcAccel() const;
		int calcBrake() const;

};

Car::Car(int year,string mak)
{
	yearModel = year;
	speed = 0;
	make = mak;
}

void Car::setYearModel(int year)
{
	yearModel = year;
}
void Car::setMake(string mak)
{
	make = mak;
}
void Car::setSpeed(int x)
{
	speed = x;
}
int Car::getYearModel() const
{
	return yearModel;
}
int Car::getSpeed() const
{
	return speed;
}
string Car::getMake() const
{
	return make;
}
int Car::calcAccel() const
{
	return speed+=5;
}
int Car::calcBrake() const
{
	return speed - 5;
}
AKat (17)
The constructor sets the value only the one time when the object is created. So if you have a function that modifies the value, it will change from 0.
Galik (2254)
If you want to modify a member variable then you can not make the function const.
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int calcAccel() const; // this can not modify member variables

int calcAccel(); // this can
CPPrangernoob55 (2)
Such a simple solution solved everything, thanks!
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