C++ Exercises: Number of days of a month from a given year and month

C++ Date: Exercise-5 with Solution

Write a C++ program to compute the number of days in a month for a given year and month.

Sample Solution-1:

C++ Code:

#include <iostream>

using namespace std;
bool is_leap_year(int y) {
  return y % 400 == 0 || (y % 4 == 0 && y % 100 != 0);
}
int no_of_days(int month, int year) {
  switch (month) {
  case 1:
  case 3:
  case 5:
  case 7:
  case 8:
  case 10:
  case 12:
    return 31;
    break;

  case 4:
  case 6:
  case 9:
  case 11:
    return 30;
    break;

  case 2:
    if (is_leap_year(year) == 1)
      return 29;
    else
      return 28;
    break;
  default:
    break;
  }

  return 0;
}

int main() {
  int year = 0;
  int month = 0;
  int days;
  cout << "Input Year: ";
  cin >> year;
  cout << "Input Month: ";
  cin >> month;
  if (year > 0 && (month > 0 && month < 13)) {
    cout << "Number of days of the year " << year << " and month " << month << " is: " << no_of_days(month, year) << endl;

  } else
    cout << "Wrong year/month!";
} 

Sample Output:

Input Year: 2019
Input Month: 04
Number of days of the year 2019 and month 4 is: 30

Flowchart:

Sample Solution-2:

C++ Code:

#include <iostream>

using namespace std;

int no_of_days(int month, int year) 
{

  if (month == 4 || month == 6 || month == 9 || month == 11) 
  {
    return 30;
  } 
  else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) 
  {
    return 31;
  } 
  else if (month == 2 && ((year % 4 == 0 && year % 100 != 0) || (year % 100 == 0 && year % 400 == 0))) 
  {
    return 29;
  } 
  else 
  {
    return 28;
  }
}

int main() 
{
  int year = 0;
  int month = 0;
  int days;
  cout << "Input Year: ";
  cin >> year;
  cout << "Input Month: ";
  cin >> month;
  if (year > 0 && (month > 0 && month < 13)) 
  {
    cout << "Number of days of the year " << year << " and month " << month << " is: " << no_of_days(month, year) << endl;

  } else
    cout << "Wrong year/month!";
}

Sample Output:

Input Year: 2019
Input Month: 04
Number of days of the year 2019 and month 4 is: 30

Flowchart:

C++ Code Editor:

Contribute your code and comments through Disqus.

Previous: Check whether a given year is a leap year not.
Next: Count the number of days between two given dates.