challenging program using operator overloading

/*solution 1 define c++ solution 2 define using C programming*/
/*
Challenging program MCA(Neel)-VNSGU
For the class Date with properties int month; int day; int year, overload  the following operators.
a. + operator [a+b (a is of date type and b is an integer), use the assumption that all years have 360
days and months 30 days.
b. – operator [a-b(same as above)]
c. = operator [ supporting a=b=c=d]
d. <,<=,>,>=
e. ++, --[post and pre both]

*/

/*
Test Case
Date : 14/01/2021
Input : +1000
Output : 24/10/2023

Input : -1000
Output : 4-4-2018

Date : 1-1-2022
Input : -1
Output : 30-12-2021

Date : 30-12-2021
Input : +1
Output : 1-1-2022

*/
/*
Solution - 1
*/
#include<iostream>
#include<stdlib.h>
using namespace std;
class date
{
    int day,month,year;
    int tday,tmonth,tyear;
    int d1,m1,y1;//geting 2nd date for compairing
    public:
        void get_data()
        {
            cout<<"Enter day";
            cin>>day;
            cout<<"Enter month";
            cin>>month;
            cout<<"Enter year";
            cin>>year;
        }
        void disp()
        {
            cout<<"\n Enter Date is "<<day<<"-"<<month<<"-"<<year;
            tday=day;
            tmonth=month;
            tyear=year;
        }

        void op()
        {
            cout<<"\n Enter Date is "<<tday<<"-"<<tmonth<<"-"<<tyear;
            cout<<"\n New Date is "<<day<<"-"<<month<<"-"<<year;
            day=tday;
            month=tmonth;
            year=tyear;
        }
        void operator +(int d)
        {

            int y=((d/30)/12);
            year=year+y;
            int m=((d/30)%12);
            month=month+m;
            day=day+(d%30);
            if(day>30)
            {
                if(month+(day/30)>12)
                {
                    year=year+1;
                    month=month+(month/12)-12;
                    day=day%30;
                }
                else
                {
                    month=month+(day/30);
                    day=day%30;
                }
            }
            if(month>12)
            {
                year=year+1;
                month=month-12;
            }
        }

        void operator -(int d)
        {
            int y=d/360;
            year=year-y;
            d=d%360;
            int m=d/30;
            if(m>=month)
            {
                year=year-1;
                month=13-m;
            }
            else
            {
                month=month-m;
            }
            d=d%30;
            if(d>=day)
            {
                if(day==d)
                {
                    day=30;
                }
                else
                {
                    day=31-d;
                }
                month=month-1;
                if(month==0)
                {
                    year=year-1;
                    month=12;
                }
            }
            else
            {
                day=day-d;
            }
        }

        void operator =(int d)
        {
            switch(d)
            {
                case 1:
                    cout<<day<<"-"<<month<<"-"<<year%100;
                    break;

                case 2:
                    cout<<month<<"-"<<day<<"-"<<year%100;
                    break;

                case 3:
                    cout<<day<<"-"<<month<<"-"<<year;
                    break;

                case 4:
                    cout<<month<<"-"<<day<<"-"<<year;
                    break;

                default:
                    cout<<"\n Invalid selection of format";
            }
        }

        void get_secnd_date()
        {
            cout<<"\n Enter 2nd date for compairing";
            cout<<"\n Enter date";
            cin>>d1;
            cout<<"\n Enter Month";
            cin>>m1;
            cout<<"\n Enter Year";
            cin>>y1;
        }

        int compare()
        {
            if(day==d1 && month==m1 && year==y1)
            {
                return 0;//both date is same
            }
            else if(year == y1)
            {
                if(month==m1)
                {
                    if(day > d1)
                    {
                        return 1;//1st date is big
                    }
                    else
                    {
                        return 2;//2nd date is big
                    }
                }
                else if(month > m1)
                {
                    return 1;
                }
                else
                {
                    return 2;
                }
            }
            else
            {
                if(year > y1)
                {
                    return 1;//1st date is big
                }
                else
                {
                    return 2;//second date is big
                }
            }
        }

        void operator <(int temp)
        {
            cout<<"\nFirst Date is "<<day<<"-"<<month<<"-"<<year;
            cout<<"\nSecond Date is "<<d1<<"-"<<m1<<"-"<<y1;
            cout<<"\n First date is less than second date=";
            compare()==2?cout<<"True":cout<<"False";
        }

        void operator <=(int temp)
        {
            cout<<"\n First date is less than or equal to second date=";
            compare()==0?cout<<"True":cout<<"False";
        }

        void operator >(int temp)
        {
            cout<<"\n First date is greter than second date=";
            compare()==1?cout<<"True":cout<<"False";
        }

        void operator >=(int temp)
        {
            cout<<"\n First date is greter than or equal to second date=";
            compare()==0?cout<<"True":cout<<"False";
        }



};
int main()
{
    date d1;
    int day,ch;
    d1.get_data();
    d1.disp();
    do
    {
        cout<<"\n1.Add day(using +)";
        cout<<"\n2.Subtract(using -)";
        cout<<"\n3.Change format of given date(=)";
        cout<<"\n4.Date compairing(<,<=,>,>=)";
        cout<<"\n5.Increment and Decrement in date";
        cout<<"\n Enter your choice";
        cin>>ch;
        switch(ch)
        {
            case 1:
                system ("CLS");//clear screen
                cout<<"\n How many day you want to insert";
                cin>>day;
                d1+day;
                cout<<"\n After adding days into date new date is ";
                d1.op();
                break;

            case 2:
                system ("CLS");//clear screen
                cout<<"\n How many day you want to subtract";
                cin>>day;
                d1-day;
                cout<<"\n After subtracting days into date new date is ";
                d1.op();
                break;

            case 3:
                system ("CLS");//clear screen
                int f;
                cout<<"\n which format you want";
                cout<<"\n1.dd-mm-yy";
                cout<<"\n2.mm-dd-yy";
                cout<<"\n3.dd-mm-Y";
                cout<<"\n4.mm-dd-Y";
                cout<<"\nEnter your format";
                cin>>f;
                d1=f;
                break;

            case 4:
                system ("CLS");//clear screen
                d1.get_secnd_date();
                d1<0;//0 is taking for temporary demo arg
                d1<=0;
                d1>0;
                d1>=0;
                break;

            case 5:
                system ("CLS");//clear screen
                cout<<"\nDate increment (pre ++)";
                d1+1;
                d1.op();
                cout<<"\nMonth increment (post ++)";
                d1+30;
                d1.op();
                cout<<"\nDate decrement(pre --)";
                d1-1;
                d1.op();
                cout<<"\nMonth decrement(post --)";
                d1-30;
                d1.op();
            break;

        }
    }while(ch>=1 && ch<=5);

}

/*
Solution - 2
*/
#include<stdio.h>
#include<conio.h>
void calculate_date(int,int,int,int,int);
int main()
{
    int d,m,y,ch,add_day,sub_day,sum;
    printf("\n Enter day");
    scanf("%d",&d);
    printf("\n Enter month");
    scanf("%d",&m);
    printf("\n Enter year");
    scanf("%d",&y);
    do
    {
        printf("\n 1. Add day(s)");
        printf("\n 2. Subtract day(s)");
        printf("\n Enter your choice");
        scanf("%d",&ch);
        switch(ch)
        {
            case 1:
            printf("\n How many days you want to insert");
            scanf("%d",&add_day);
            printf("Input date is %d - %d - %d",d,m,y);
            calculate_date(d,m,y,add_day,1);//1 means add days
            break;

            case 2:
            printf("\n How many days you want to cut");
            scanf("%d",&add_day);
            printf("Input date is %d - %d - %d",d,m,y);
            calculate_date(d,m,y,add_day,2);//2 means cut days
            break;
        }
    }while(ch>=1 && ch<=2);
}
void calculate_date(int day,int month,int year,int d,int op)
{
    int tempy1,tempy2;
    int sum;
    tempy1=year%100;
    tempy2=year/100;
    if(op==1)//add days
    {
        sum=(tempy1*360)+(month*30)+day;
        sum=sum+d;
    }
    else//op2 means subtract days
    {
        sum=(tempy1*360)+(month*30)+day;
        sum=sum-d;
    }
    day=sum%30;
    if(day==0)
    {
        day=30;
        sum=sum-1;
    }
    sum=sum/30;
    year=sum/12;
    month=sum%12;
    if(month==0)
    {
        year=year-1;
        month=12;
    }

    printf("\n After %d days new date is=",d);
    printf("%d - %d - %d",day,month,year+(100*tempy2));

}