[Aedii2001-commits] CVS: aedii2001/src dates.c,NONE,1.1 dates.h,NONE,1.1

[Carlos R. <cr...@us...>]

Update of /cvsroot/aedii2001/aedii2001/src
In directory usw-pr-cvs1:/tmp/cvs-serv8612/src

Added Files:
	dates.c dates.h 
Log Message:
modulo de tratamento de datas (agora sim)

--- NEW FILE: dates.c ---
/*
 *  Faculdade de Ciências e Tecnologia
 *     Universidade Nova de Lisboa
 *
 * Algoritmos e Estruturas de Dados II
 *             2001 / 2002
 *
 *      Carlos Rodrigues    9566
 *      Helder Correia      9937
 */


/* Tratamento de datas */
         

#include <stdio.h>

#include "dates.h"


static int is_leap_year(int year);


static int days_in_month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
static int accum_days[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
static int accum_days_leap[] = { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 };


static int is_leap_year(int year)
{
    return (year % 4) == 0;
}


int is_valid_date(int day, int month, int year)
{
    return year >= MIN_YEAR &&
        month >= 1 &&
        month <= MAX_MONTH &&
        day >= 1 &&
        day <= ((is_leap_year(year) && month == 2) ? 29 : days_in_month[month - 1]);
}


int date_to_yearday(int day, int month, int year)
{
    int *accum_days_p;

    if (!is_valid_date(day, month, year)) {
        return -1;
    }
    
    accum_days_p = is_leap_year(year) ? accum_days_leap : accum_days;

    return accum_days_p[month - 1] + day;
}


int yearday_to_date(int yearday, int year, int *day, int *month)
{
    int i;
    int *accum_days_p;

    if (yearday < 0 || yearday > is_leap_year(year) ? MAX_DAYS_YEAR_LEAP : MAX_DAYS_YEAR ) {
        return -1;
    }

    accum_days_p = is_leap_year(year) ? accum_days_leap : accum_days;

    for (i = 0; i < MAX_MONTH; i++) {
        if (yearday <= accum_days_p[i]) {
            break;
        }
    }

    *month = i;
    *day = yearday - accum_days_p[i - 1];

    return 0;
}


/*
int main(int argc, char *argv[])
{
    int d, m, y, i;

    scanf("%d %d %d", &d, &m, &y);

    i = date_to_yearday(d, m, y);
    printf("Day %d\n", i);

    yearday_to_date(i, y, &d, &m);
    printf("Is date: %d %d %d\n", d, m, y);

    return 0;
}
*/


/* EOF - dates.c */

--- NEW FILE: dates.h ---
/*
 *  Faculdade de Ciências e Tecnologia
 *     Universidade Nova de Lisboa
 *
 * Algoritmos e Estruturas de Dados II
 *             2001 / 2002
 *
 *      Carlos Rodrigues    9566
 *      Helder Correia      9937
 */


/* Tratamento de datas */


#ifndef _DATES_H
#define _DATES_H


#define MAX_DAY   31
#define MAX_MONTH 12
#define MIN_YEAR  1901

#define MAX_DAYS_YEAR      365
#define MAX_DAYS_YEAR_LEAP 366


int is_valid_date(int day, int month, int year);
int date_to_yearday(int day, int month, int year);
int yearday_to_date(int yearday, int year, int *day, int *month);


#endif /* _DATES_H */