Create a structure

Write a C program to create a structure called date with day, month and year as the data member and to find the difference between two dates.

Special Constraints:

1. Get the start date and the end date.

2. Consider that both these days fall in the same year and that year will be a non-leap year.

3. Also, find the number of days between the given days.

4. Include both the starting date and ending date.

Sample Input and Output:

Enter the starting date

Enter the starting day

14

Enter the starting month

11

Enter the starting year

2015

Enter the ending date

Enter the ending day

17

Enter the ending month

11

Enter the ending year

2015

Number of days is 4

Implementation of the above problem:

#include<stdio.h> 

// A date has day 'd', month 'm' and year 'y'

struct Date12

{

int d, m, y;

};

// To store number of days in all months from January to Dec.

const int monthDays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

// This function counts number of leap years before the given date

int countLeapYears(struct Date12 d)

{

int years = d.y; 

// Check if the current year needs to be considered for the count of leap years or not

if (d.m <= 2)

years--;

// An year is a leap year if it is a multiple of 4, multiple of 400 and not a multiple of 100.

return years / 4 - years / 100 + years / 400;

}

 // This function returns number of days between two given dates

int getDifference(struct Date12 dt1, struct Date12 dt2)

{

// COUNT TOTAL NUMBER OF DAYS BEFORE FIRST DATE 'dt1'

int i;

// initialize count using years and day

long int n1 = dt1.y*365 + dt1.d;

// Add days for months in given date

for ( i=0; i<dt1.m - 1; i++)

n1 += monthDays[i];

// Since every leap year is of 366 days, Add a day for every leap year

n1 += countLeapYears(dt1); 

// SIMILARLY, COUNT TOTAL NUMBER OF DAYS BEFORE 'dt2' 

long int n2 = dt2.y*365 + dt2.d;

for ( i=0; i<dt2.m - 1; i++)

n2 += monthDays[i];

n2 += countLeapYears(dt2); 

 // return difference between two counts

return (n2 - n1);

} 

// Driver program

int main()

{

struct Date12 dt1;

struct Date12 dt2 ;

printf("Enter the starting date\n");

printf("Enter the starting day\n");

scanf("%d",&dt1.d);

printf("Enter the starting month\n");

scanf("%d",&dt1.m);

printf("Enter the starting year\n");

scanf("%d",&dt1.y);

printf("Enter the ending date\n");

printf("Enter the ending day\n");

scanf("%d",&dt2.d);

printf("Enter the ending month\n");

scanf("%d",&dt2.m);

printf("Enter the ending year\n");

scanf("%d",&dt2.y);

printf("Number of days is %d",getDifference(dt1,dt2)+1); 

return 0;

}

Thanks

Mukesh Rajput