I am having trouble in the Date::SetDate() function. Basically I don\'t know why

Question

I am having trouble in the Date::SetDate() function. Basically I don't know why at the end my evaluation for leap year is always false at the end of this function. At beginning of this function that's the first thing I test for, and it works as expected; it prints "yes its leap year" when year is true and "no its not a leap year" etc. However, at the end of this function, the very same bool variable that worked well in the beginning becomes FALSE every time. I just cant see where I changed the value of this bool isLeap.

class Date
{
     private:
        int Day, Month, Year;
        bool isLeap;
    public:
        //CONSTRUCTOR
        Date();
        //ACCESSORS         void SetDate(int, int, int); //Checks for validity of input
        void DisplayNumerically() const ; //const promises data will not be changed
        void DisplayTextually() const;

   
};

Date::Date()    //Inital default values
{
    Day = 1;
    Month = 1;
    Year = 0;
    isLeap = false;
}

void Date::SetDate(int Y, int M, int D) //Defind method SetDate
{
    Year = Y;
    Month = M;
    Day = D;

    if ( (Year%4 == 0) && (Year%100 !=0 ) ||( Year %400== 0) ) //**Works OK*//
    {
        isLeap == true;
        cout << "yes its leap"<<endl;
        cout << isLeap<<endl;
    }
    else                                                                                 //**Works ok**//
    {
        isLeap == false;
        cout <<" no its not leap"<<endl;
        cout<< isLeap<<endl;
    }


    if (Year <0 )
    {
        cout <<"1.ERROR:-Invalid Year now terminating..."<<endl;
        exit(0);
    }
    //if( ( Year < 0 )   || ( Year > 2012) && (Month > 2 ) )
    //{
      // cout << "1.ERROR:- Invalid year now terminating..."<<endl;
    //    exit(0);
    //}
    if (Month > 12 || Month < 1)
    {
        cout << "2.ERROR:- Invalid Month now terminating..."<<endl;
        exit(0);
    }
    if (Day < 1 || Day > 31)
    {
        cout << "3.ERROR:- INvallid # of Days now terminating..."<<endl;
        exit(0);
    }
    if (   ( Month == 4 || Month == 6 || Month == 9 ||   Month == 11) && (Day >= 31 ) ) //Months with 31 days and up
    {
        cout <<"4.Error-: Invalid # of Days with Mo. now terminating..."<<endl;
        exit(0);
    }

    //if ( isLeap == true && Month == 2 && Day > 29   )
    //{
      // cout << "6.ERROR: Too many days for february (leap) > 29 now terminating..."<<endl;
        //exit(0);
    //}

    if ( Day > 28 && Month == 2 && isLeap == false ) //If Not Leap year and february has more than 28 days
    {
        cout << "5.ERROR:- Invalid # of Days with Mo. LEAPFALSE now terminating..."<<endl;
        exit(0);
    }
    //else if ( isLeap == true && Month == 2 && Day ==29)
    if (isLeap == false)                                 //*****/*/*Dont know why its always false**////
        cout << "FALSE"<<endl;                       ///This ALWays prints--WHY????????///////


}


int main()
{
   Date OneDate;

    int Y, M, D;
    cout <<" ------------------- Enter a year, month and day numerically: "<<endl;
    cin >> Y >> M >> D;
    OneDate.SetDate(Y,M,D);
    cout<<endl<<endl;

    OneDate.SetDate(Y,M,D);

    return 0;
} I am having trouble in the Date::SetDate() function. Basically I don't know why at the end my evaluation for leap year is always false at the end of this function. At beginning of this function that's the first thing I test for, and it works as expected; it prints "yes its leap year" when year is true and "no its not a leap year" etc. However, at the end of this function, the very same bool variable that worked well in the beginning becomes FALSE every time. I just cant see where I changed the value of this bool isLeap.

class Date
{
     private:
        int Day, Month, Year;
        bool isLeap;
    public:
        //CONSTRUCTOR
        Date();
        //ACCESSORS         void SetDate(int, int, int); //Checks for validity of input
        void DisplayNumerically() const ; //const promises data will not be changed
        void DisplayTextually() const;

   
};

Date::Date()    //Inital default values
{
    Day = 1;
    Month = 1;
    Year = 0;
    isLeap = false;
}

void Date::SetDate(int Y, int M, int D) //Defind method SetDate
{
    Year = Y;
    Month = M;
    Day = D;

    if ( (Year%4 == 0) && (Year%100 !=0 ) ||( Year %400== 0) ) //**Works OK*//
    {
        isLeap == true;
        cout << "yes its leap"<<endl;
        cout << isLeap<<endl;
    }
    else                                                                                 //**Works ok**//
    {
        isLeap == false;
        cout <<" no its not leap"<<endl;
        cout<< isLeap<<endl;
    }


    if (Year <0 )
    {
        cout <<"1.ERROR:-Invalid Year now terminating..."<<endl;
        exit(0);
    }
    //if( ( Year < 0 )   || ( Year > 2012) && (Month > 2 ) )
    //{
      // cout << "1.ERROR:- Invalid year now terminating..."<<endl;
    //    exit(0);
    //}
    if (Month > 12 || Month < 1)
    {
        cout << "2.ERROR:- Invalid Month now terminating..."<<endl;
        exit(0);
    }
    if (Day < 1 || Day > 31)
    {
        cout << "3.ERROR:- INvallid # of Days now terminating..."<<endl;
        exit(0);
    }
    if (   ( Month == 4 || Month == 6 || Month == 9 ||   Month == 11) && (Day >= 31 ) ) //Months with 31 days and up
    {
        cout <<"4.Error-: Invalid # of Days with Mo. now terminating..."<<endl;
        exit(0);
    }

    //if ( isLeap == true && Month == 2 && Day > 29   )
    //{
      // cout << "6.ERROR: Too many days for february (leap) > 29 now terminating..."<<endl;
        //exit(0);
    //}

    if ( Day > 28 && Month == 2 && isLeap == false ) //If Not Leap year and february has more than 28 days
    {
        cout << "5.ERROR:- Invalid # of Days with Mo. LEAPFALSE now terminating..."<<endl;
        exit(0);
    }
    //else if ( isLeap == true && Month == 2 && Day ==29)
    if (isLeap == false)                                 //*****/*/*Dont know why its always false**////
        cout << "FALSE"<<endl;                       ///This ALWays prints--WHY????????///////


}


int main()
{
   Date OneDate;

    int Y, M, D;
    cout <<" ------------------- Enter a year, month and day numerically: "<<endl;
    cin >> Y >> M >> D;
    OneDate.SetDate(Y,M,D);
    cout<<endl<<endl;

    OneDate.SetDate(Y,M,D);

    return 0;
}

Explanation / Answer

void Date::SetDate(int Y, int M, int D) //Defind method SetDate { Year = Y; Month = M; Day = D; if ( (Year%4 == 0) && (Year%100 !=0 ) ||( Year %400== 0) ) //**Works OK*// { isLeap == true; cout

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