Question

c++

Write the implementation (.cpp file) of the Counter class of the previous exercise.
The full specification of the class is:

• A data member counter of type int.
• An data member named counterID of type int.
• A static int data member named nCounters which is initialized to 0.
• A constructor that takes an int argument and assigns its value to counter. It also adds one to the static variable nCounters and assigns the (new) value of nCounters to counterID.
• A function called increment that accepts no parameters and returns no value. increment adds one to the instance variable counter.
• A function called decrement that accepts no parameters and returns no value. decrement subtracts one from the counter.
• A function called getValue that accepts no parameters and returns an int. It returns the value of the instance variable counter.
• A function named getCounterID that accepts no parameters and returns an int. getCounterID returns the value of the data member counterID.

The previous exercise:

Write the header file (.h file) of a class Counter containing:

• A data member counter of type int.
• A data member named counterID of type int.
• A static int data member named nCounters.
• A constructor that takes an int argument.
• A function called increment that accepts no parameters and returns no value.
• A function called decrement that accepts no parameters and returns no value.
• A function called getValue that accepts no parameters and returns an int.
• A function named getCounterID that accepts no parameters and returns an int.

Answer 1

C++ Program:

File: Counter.cpp

#include "Counter.h"

//Static field initialization
int Counter::nCounters = 0;

//Constructor
Counter::Counter(int val)
{
counter = val;
nCounters = nCounters + 1;
counterID = nCounters;
}

//Increment
void Counter::increment()
{
counter = counter + 1;
}

//decrement
void Counter::decrement()
{
counter = counter - 1;
}

//Returns the counter value
int Counter::getValue()
{
return counter;
}

//Returns the counterId value
int Counter::getCounterID()
{
return counterID;
}

File: Counter.h

#ifndef COUNTER_H_INCLUDED
#define COUNTER_H_INCLUDED

class Counter
{
private:
int counter;
int counterID;
static int nCounters;

public:
Counter(int);//Constructor
void increment();
void decrement();
int getValue();
int getCounterID();
};

#endif // COUNTER_H_INCLUDED

File: main.cpp

#include <iostream>
#include "Counter.h"

using namespace std;

int main()
{
//Counter object
Counter cObj(10), cObj1(50);

cout << "\nCounter Id: " << cObj.getCounterID();
cout << "\nCounter Value: " << cObj.getValue();

cout << "\nIncrementing counter five times\n";
//Increment
cObj.increment();
cObj.increment();
cObj.increment();
cObj.increment();
cObj.increment();

cout << "\nDecrementing counter\n";
//Decrement
cObj.decrement();
cout << "\nCounter Value: " << cObj.getValue();

cout << "\n\n\nCounter Id: " << cObj1.getCounterID();
cout << "\nCounter Value: " << cObj1.getValue();

cout << "\n\n";

return 0;
}
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Sample Run: