#include #include #include int Days(int Month,int Year); int Days_Passed(int Month,int Year,int Date); int Day(int Month,int Year,int Date); void main() { int m,y,d; clrscr(); cout << "\n\n--------------------> Mr. Calendar <------------------"; do { cout << "\n\n-----------------------------------------------------------------\n"; cout << "Enter month : "; cin >> m; cout << "Enter year : "; cin >> y; cout << "Enter Date : "; cin >> d; cout << "\nThe numbers of days in the given month are " << Days(m,y); cout << "\nThe total numbers of days since the beg. of year till the given month are " << Days_Passed(m-1,y,d); cout << "\nThe day is " << Day(m-1,y,d); cout << "\n\nPress Esc to quit , any other key to try again......."; } while (getch()!=27); } int Days(int m,int y) { return 30+(m+m/8)%2+(1-((3*m-6)/(3*m-7))-1/m)*(-1-(3*(y%4))/(3*(y%4)-1)-3*(y%400)/(3*(y%400)-1)+3*(y%100)/(3*(y%100)-1)); } int Days_Passed(int m ,int y,int d) { return d+((m+(m%2))/2+(m/8)*(1-(m%2)))*31+(m/2-(m/8)*(1-(m%2)))*30+((3*m-3)/(3*m-4))*(-2+1-(3*(y%4))/(3*(y%4)-1)-3*(y%400)/(3*(y%400)-1)+3*(y%100)/(3*(y%100)-1)); } int Day(int m ,int y,int d) { return (d+((m+(m%2))/2+(m/8)*(1-(m%2)))*31+(m/2-(m/8)*(1-(m%2)))*30+((3*m-3)/(3*m-4))*(-2+1-(3*(y%4))/(3*(y%4)-1)-3*(y%400)/(3*(y%400)-1)+3*(y%100)/(3*(y%100)-1))+(y+((y-1)/4)-(y/100)+(y/400))-1) % 7; }