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days_between_dates
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#include <stdio.h>
#include <stdlib.h>
int days_in_months[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int date(int ddmmyyyy) {
int d = ddmmyyyy / 1000000;
return d;
}
int month(int ddmmyyyy) {
int temp = ddmmyyyy % 1000000;
int m = temp / 10000;
return m;
}
int year(int ddmmyyyy) {
int y = ddmmyyyy % 10000;
return y;
}
int isleap(int year) {
if (year % 400 == 0)
return 1;
if (year % 100 == 0)
return 0;
if (year % 4 == 0)
return 1;
else
return 0;
}
int number_of_days(int year) {
int leap_days = 0;
for (int i = 1; i <= year; i++) {
if (isleap(i) == 1)
leap_days++;
}
return leap_days;
}
int isvalid(int date, int month, int year) {
if (date > 31 || date <= 0)
return 10;
if (month > 12 || month <= 0)
return 11;
if (year <= 0)
return 12;
if ((month == 1) || (month == 3) || (month == 5) || (month == 7) ||
(month == 8) || (month == 10) || (month == 12) && date <= 31)
return 1;
if ((month == 4) || (month == 6) || (month == 9) ||
(month == 11) && date <= 30)
return 1;
if (month == 2 && date <= 28)
return 1;
if (month == 2 && isleap(year) == 1 && date <= 29)
return 1;
}
void main() {
int ddmmyyyy_1, ddmmyyyy_2;
printf("Enter first date(DDMMYYYY): ");
scanf("%d", &ddmmyyyy_1);
printf("Enter second date(DDMMYYYY): ");
scanf("%d", &ddmmyyyy_2);
int date_1 = date(ddmmyyyy_1), month_1 = month(ddmmyyyy_1),
year_1 = year(ddmmyyyy_1);
int date_2 = date(ddmmyyyy_2), month_2 = month(ddmmyyyy_2),
year_2 = year(ddmmyyyy_2);
int ret1 = isvalid(date_1, month_1, year_1);
if (ret1 == 10)
printf("The day of date %d-%d-%d in invalid! Please check again\n", date_1,
month_1, year_1);
if (ret1 == 11)
printf("The month of date %d-%d-%d in invalid! Please check again\n",
date_1, month_1, year_1);
if (ret1 == 12)
printf("The year of date %d-%d-%d in invalid! Please check again\n", date_1,
month_1, year_1);
int ret2 = isvalid(date_2, month_2, year_2);
if (ret2 == 10)
printf("The day of date %d-%d-%d in invalid! Please check again\n", date_2,
month_2, year_2);
if (ret2 == 11)
printf("The month of date %d-%d-%d in invalid! Please check again\n",
date_2, month_2, year_2);
if (ret2 == 12)
printf("The year of date %d-%d-%d in invalid! Please check again\n", date_2,
month_2, year_2);
if (ret1 == 1 && ret2 == 1) {
int days_1 = 0;
if (month_1 == 1)
days_1 = 0;
else {
for (int i = 0; i < month_1; i++) {
days_1 = days_1 + days_in_months[i];
}
}
int days1 = (year_1 - 1) * 365 + days_1 + date_1 + number_of_days(year_1);
int days_2 = 0;
if (month_2 == 1)
days_2 = 0;
else {
for (int i = 0; i < month_2; i++) {
days_2 = days_2 + days_in_months[i];
}
}
int days2 = (year_2 - 1) * 365 + days_2 + date_2 + number_of_days(year_2);
int NumberOfDays = days2 - days1 + 1;
if ((month_1 < 3 && month_2 > 2) && year_1 == year_2 &&
isleap(year_1) == 1) {
NumberOfDays = NumberOfDays + 1;
printf("Number days between dates %d-%d-%d and %d-%d-%d are: %d\n",
date_1, month_1, year_1, date_2, month_2, year_2, NumberOfDays);
} else {
printf("Number days between dates %d-%d-%d and %d-%d-%d are: %d\n",
date_1, month_1, year_1, date_2, month_2, year_2, NumberOfDays);
}
}
}