Question

2 The following code has some errors. Please point out and correct them (there might be more than 1 errors). Note: the use of const data member increment and member function print. // This code has some errors. #include using namespace std; class Increment { public: Increment( int c = 0, int i = 0); void addIncrement() const { count -= increment }; void print() const; private: int count; const int increment; }; Increment::Increment(int c, int i) { cout = c; increment = i; } void Increment::print() { cout << “count = “ << count << “increment = “ << increment << endl; } int main() { Increment value(6); value.addIncrement(); cout << print(); return 0; }

Answer 1

#include <iostream>
using namespace std;

class Increment {
public:
    Increment(int c = 0, int i = 0);
    void addIncrement() { count += increment; };//const function can not make changes to object, so const removed
    //also, addIncrrement must add increment, instead of subtracting it
    void print() const;//it can be const, since it simply prints the values

private:
    int count;
    const int increment;
};
Increment::Increment(int c, int i):increment(i)//const data members must be initialised using initializer lists, and not inside the constrctor or the class
{
    count = c;//cout is not a member variable, count is
}
void Increment::print() const
{
    cout << "count = " << count << " increment = "<< increment << endl;
}
int main()
{
    Increment value(6);
    value.addIncrement();
    value.print();//print function needs to be called using the object
    return 0;
}