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11.CPP
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11.CPP
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#include<iostream.h>
#include<conio.h>
#include<process.h>
class date {
public:
int flag, dd, mm, yy;
date(int d, int m, int y) {
dd = d;
mm = m;
yy = y;
if ((y % 4) == 0)
flag = 1;
else {
flag = 0;
if (m == 2 && d > 28) {
cout << "Error since not a leap year";
getch();
exit(0);
}
}
}
int return_date(date d);
int operator - (date d2);
date operator + (int n);
friend ostream & operator << (ostream & out, date d1);
};
int a[20] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int b[20] = { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int date::operator - (date d2) {
int a1, a2, x = 0;
date d1(dd, mm, yy);
if (d1.dd == d2.dd && d1.mm == d2.mm && d1.yy == d2.yy)
return x;
if (d1.dd < d2.dd && d1.mm == d2.mm && d1.yy == d2.yy) {
cout << "Error since 2nd date is greater than 1st date";
getch();
exit(0);
}
if (d1.mm < d2.mm && d1.yy == d2.yy) {
cout << "Error since 2nd date is greater than 1st date";
getch();
exit(0);
}
if (d1.yy < d2.yy) {
cout << "Error since 2nd date is greater than 1st date";
getch();
exit(0);
}
a1 = return_date(d1);
a2 = return_date(d2);
for (int i = d1.yy - 1; i > d2.yy; i--) {
if (i % yy == 0)
x = x + 366;
else
x = x + 365;
}
if (d1.yy == d2.yy)
x = x + a1 - a2;
else {
x = x + a1;
if (d2.yy % 4 == 0)
x = x + (366 - a2);
else
x = x + (365 - a2);
}
return x;
}
int date::return_date(date d) {
int int_val = d.dd;
if ((d.flag == 1) && (d.mm > 2)) {
for (int i = 0; i < d.mm; i++)
int_val = int_val + a[i];
int_val++;
} else {
for (int i = 0; i < d.mm; i++)
int_val = int_val + a[i];
}
return int_val;
}
date date::operator + (int n) {
date d(dd, mm, yy);
for (int i = 0; i < n; i++) {
d.dd++;
if (d.yy % 4 == 0) {
d.flag = 1;
if (d.dd > b[d.mm]) {
d.dd = 1;
d.mm++;
}
} else {
d.flag = 0;
if (d.dd > a[d.mm]) {
d.dd = 1;
d.mm++;
}
}
if (d.mm > 12) {
d.mm = 1;
d.yy++;
}
}
return d;
}
ostream & operator << (ostream & out, date d1) {
out << d1.dd << "-" << d1.mm << "-" << d1.yy;
return out;
}
int main() {
clrscr();
int d, m, y, no_of_days;
cout << "Enter a valid date(dd mm yyyy): ";
cin >> d >> m >> y;
if (d > b[m] || m > 12) {
cout << "Error";
getch();
exit(0);
}
date d1(d, m, y);
cout << "Enter a valid date which is lesser than the first date: ";
cin >> d >> m >> y;
if (d > b[m] || m > 12) {
cout << "Error";
getch();
exit(0);
}
date d2(d, m, y);
no_of_days = d1 - d2;
cout << "Difference b/w two dates in days :" << no_of_days << endl;
cout << "Enter a no of days to be added to first date: ";
cin >> no_of_days;
d1 = d1 + no_of_days;
cout << "The new date is:" << d1 << endl;
getch();
return 0;
}