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Write a program that asks the user for a date in the format mm/dd/yyyy, using a custom struct to store the date information entered in memory. The program should call a custom function that adds seven days to the user's date, passing in the data in and out of the custom function using the custom struct for the dates. The program should then print out the original date entered and the date one week later. C code should include meaningful comments to explain what the code does and how it works.

Explanation / Answer

Solution:

#include <stdio.h>

struct date {
   int month;
   int day;
   int year;
};

// function adds 7 days to the date
struct date addSevenDays(struct date newDate)
{
   // add 7 days
   newDate.day += 7;
  
   // months having 31 days
   if ((newDate.month == 1 || newDate.month == 3 || newDate.month == 5 || newDate.month == 7 ||
       newDate.month == 8 || newDate.month == 10 || newDate.month == 12) && newDate.day > 31)
   {
       // new month
       newDate.day -= 31;
       newDate.month += 1;
   }
   // months having 30 days
   else if ((newDate.month == 4 || newDate.month == 6 || newDate.month == 9 || newDate.month == 11) && newDate.day > 30)
   {
       newDate.day -= 30;
       // new month
       newDate.month += 1;
   }
   // February
   else
   {
       if (newDate.year % 4 == 0 && newDate.day > 29)
       {
           newDate.day -= 29;
           newDate.month += 1;
       }
       else if (newDate.day > 28)
       {
           newDate.day -= 28;
           newDate.month += 1;
       }
   }
  
   // year changed
   if (newDate.month > 12)
   {
       newDate.month = 1;
       newDate.year += 1;
   }
  
   return newDate;
}

int main() {
   struct date originalDate;
   struct date newDate;
  
   // prompt to read the date
   printf("Enter a date in mm/dd/yyyy format: ");
   scanf("%d/%d/%d", &originalDate.month, &originalDate.day, &originalDate.year);
  
   // call function to add 7 days and assign it to newDate
   newDate = addSevenDays(originalDate);

   printf(" Original Date: %d/%d/%d ", originalDate.month, originalDate.day, originalDate.year);
   printf(" New Date after adding 7 days: %d/%d/%d ", newDate.month, newDate.day, newDate.year);

   return 0;
}

Output:

Enter a date in mm/dd/yyyy format: 1/21/2017                                                                                                                                    

Original Date: 1/21/2017                                                                                                                                                        

New Date after adding 7 days: 1/28/2017

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