Question

Write a program in C that reads a month and a day in that month and computes how many days it is since
December 26th of previous year. For example, if input is 1 10 (January 10th), the number of days since
December 26th is 15. The program computes the number of days for a nonleap year (February has always
28 days). The input is two integers, one between 1 and 12 (inclusive) and one between 1 and 31 (inclusive)
and the output will be a single line “X days”, where X is the number of days.

Answer 1

Hello, here is the answer to this question.

EXPLANATION:

First we will declare few variables & initialize them.
We will take a variable fixed and initialize it with 26 as we have to calculate value from 26th december.
We will take a variable monthend and initialize it with 31 as there are 31 days in a month according to the question.
We will initialize the result variable with 0 value, which will later hold the solution.

Coming on to the algorithm:

We will make 2 cases:
1) If the month is January or Feb:
    We will calculate by this formula : result = (monthend * (month-1)) + (monthend - fixed) + day;

   monthend - fixed will give the value of the remaining days of the december month
   monthend * month-1 will give the days in the new year.

2) If the month is any other than January or February:
    We will calculate using this formula : result = (monthend * (month-1)) + (monthend - fixed) + day - 3;
    We are subtractiing by 3 because Feb month has 3 days less than the other months.

CODE:

#include <stdio.h>

int main()
{
    // VARIABLE DECLARATION
    int month,day;
    int fixed = 26;
    int monthend = 31;
    int result = 0;
  

    printf("Please Enter the Month and Day : ");
    scanf("%d %d",&month,&day);
    // if the month is Jan or Feb
    if( month == 1 || month == 2 ) {
        result = (monthend * (month-1)) + (monthend - fixed) + day;
    }
    // Any month except jan and feb.
    if( month > 2) {
        result = (monthend * (month-1)) + (monthend - fixed) + day - 3;
    }
  

    printf(" There are : %d Days!",result);

    return 0;
}

OutPut: