Leaf year or not using Function in OOP C++

 Q:  Write a function, which accept a year value as argument; display the message if the year is prime otherwise display that year is not a leap year. Write a main program which will call the function by passing a year value the function.

Ans::: 

#include <iostream>

using namespace std;

bool leapYear(int y);

int main(){

   int y;

   cout<<"Enter year: ";

   cin>>y;

   //Calling function

   bool flag = leapYear(y);

   if(flag == true)  

      cout<<y<<" is a leap Year"; 

   else 

      cout<<y<<" is not a leap Year";

   return 0;

}

bool leapYear(int y){

   bool isLeapYear = false;

   if (y % 4 == 0) {

      if (y % 100 == 0) {

         if (y % 400 == 0) {

            isLeapYear = true;

         }

      } 

      else isLeapYear = true;

   }

   return isLeapYear;

}