1760311_BTVN_Tuan06 - Bai06

Ham.cpp

#include "Ham.h"
int CheckLeap(int year){
	int leap;
	if (year % 4 == 0 || (year % 4 == 0 && year % 100 != 0)) leap = 1;
	else leap = 0;
	return leap;
}
int DayInMonth(int month, int year){
	int nday;
	switch (month)
	{
	case 1: case 3: case 5: case 7:case 8: case 10: case 12: nday = 31; break;
	case 4:case 6: case 9: case 11: nday = 30;
	case 2: if (CheckLeap(year) == 1) nday = 29; 
			else nday = 28;
	default:
		break;
	}
	return nday;
}

int inSeason(int month){
	int season;
	switch (month)
	{
	case 1: case 2: case 3: season = 1; break;
	case 4: case 5: case 6: season = 2; break;
	case 7: case 8: case 9: season = 3; break;
	case 10: case 11: case 12: season = 4; break;
	default:
		break;
	}
	return season;
}

int DistanceFromBegin(int day, int month, int year){
	int distance = 0;
	for (int i = 1; i < month; i++){
		if (month>1)
		distance += DayInMonth(i, year);
		else return day;
	}
	return distance + day;
}

void NextDay(int day, int month, int year, int &nextday, int &nextmonth, int &nextyear){
	if (day == 28 || day == 29 || day == 30 || day == 31) {
		nextday = 1;
		if (month == 12){
			nextyear = year+1;
			nextmonth = 1;
		}
		else {
			nextmonth = month + 1;
			nextyear = year;
		}
	}
	else {
		nextday = day+1;
		nextmonth = month;
		nextyear = year;
	}
}

void PreviousDay(int day, int month, int year, int &preday, int &premonth, int &preyear){
	if (day == 1){
		if (month == 1){
			premonth = 12;
			preyear = year-1;
			preday = DayInMonth(premonth, preyear);
		}
		else {
			premonth = month-1;
			preyear = year;
			preday = DayInMonth(premonth, preyear);
		}
	}
	else {
		premonth = month;
		preyear = year;
		preday = day-1;
	}
}

Ham.h

#ifndef BAI06_
#define BAI06_
#include <stdio.h>
#include <conio.h>
int CheckLeap(int year);
int DayInMonth(int month, int year);
int inSeason(int month);
int DistanceFromBegin(int day, int month, int year);
void NextDay(int day, int month, int year, int &nextday, int &nextmonth, int &nextyear);
void PreviousDay(int day, int month, int year, int &preday, int &premonth, int &preyear);
#endif

Main.cpp

#include "Ham.h"
void main(){
	int day, month, year, nextday, nextmonth, nextyear, preday, premonth, preyear;
	printf("Input day :");
	scanf_s("%d", &day);
	printf("Input month : ");
	scanf_s("%d", &month);
	printf("Input year : ");
	scanf_s("%d", &year);
	if (CheckLeap(year) == 1) printf("Leap year!");
	else printf("Not a leap year!");
	printf("\nThe day in month is  : %d \n", DayInMonth(month, year));
	printf("\n This month belongs to season %d\n", inSeason(month));
	printf("\n Distance from begin is : %d\n", DistanceFromBegin(day, month, year));
	NextDay(day, month, year, nextday, nextmonth, nextyear);
	printf("The next day is : %d/%d/%d\n", nextday, nextmonth, nextyear);
	PreviousDay(day, month, year, preday, premonth, preyear);
	printf("The previous day is : %d/%d/%d\n", preday, premonth, preyear);
	_getch();

}