C program :

Write a function daysIntoYear that, given a valid date, determines which numbered days of the year that is. For example, 3/1/2009 is day #60 of the year 2009, whereas 3/1/2008 is day #61 of the year 2008. Also, add add the following code to main, just before the return statement:

What type does leapyear return

What is the type of leapyears parameter?

if (validDate(month,day,year))

printf("%d/%d/%d is a valid date ", month, day, year);

else

printf("%d/%d/%d is not a valid date ", month, day, year);

********C - CODE************************************************************************************************************************************

#include "pch.h"

#include

/*dates.c This program includes several functions relating to dates.*/

/* leapyear Determine whether year is a leap year: returns 1 for leap years, and 0 otherwise. (Assumes valid year)*/

int leapyear(int year)

{

if (year % 2000 == 0 || (year % 4 == 0 && year % 100 != 0))

return 1;

else return 0;

}

/* howManyDays Determine how many days are in a given month in a given year.Returns that number of days. (Assumes valid dates)*/

int howManyDays(int month, int year)

{

int days;

switch (month)

{

case 1: case 3: case 5: case 7: case 8: case 10: case 12:

days = 31;

break;

case 4: case 6: case 9: case 11:

days = 30;

break;

case 2:

if (leapyear(year))

days = 29;

else

days = 28;

break;

default:

days = 0;

break;

}

return days;

}

/* validDateDetermine whether given month/day/year combo is a valid date:returns 1 for valid date, and 0 otherwise.*/

/* Your function validDate goes here */

/* daysIntoYear Given a valid month/day/year combo, determines how many days into the year that date is: for example, 3/1/2009 is day #60. Returns

that number. (Assumes valid date)*/

/* Your function daysIntoYear goes here */

int main(void)

{

int month, day, year;

printf("Please enter date (mm/dd/yyyy): ");

scanf_s("%d/%d/%d", &month, &day, &year);

printf("The date you entered was: %d/%d/%d ", month, day, year);

if (leapyear(year))

printf("Year %d is a leap year. ", year);

else

printf("Year %d is not a leap year. ", year);

printf("Month #%d in year %d has %d days. ",

month, year, howManyDays(month, year));

}