Question

Write the definition of a class Counter containing: An instance variable named counter of type int. An instance variable named counterID of type int. A static int variable nCounters which is initialized to zero. 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 result to the instance variable counterID. A method named increment. It does not take parameters or return a value; it just adds one to the instance variable counter. A method named decrement that also doesn't take parameters or return a value; it just subtracts one from the counter. A method named getValue. It returns the value of the instance variable counter. A method named getCounterID: it returns the value of the instance variable counterID.

Answer 1

The definition of a class Counter

class Counter

{  

Private :                        //access modifier

int counter;                  //defining and initialising variables

int counterID;

static int nCounters=0;

Public :                               //access modifier

Counter(int a)                     //defining functions

{

counter=a;                 //initialising variable counter with argument a          

nCounters++;                   //incrementing 1 to variable nCounters

}

void increment()

{

counter=counter + 1;

}

void decrement()

{

counter=counter - 1;

}

int getValue()

{

return counter;          //returning integer value contained in counter

}

int getCounterID()

{

return counterID;     //returning integer value contained in counter

}

};       //class definition ends