C++ Exercises: Check whether a given year is a leap year not

Last update on August 15 2025 12:41:37 (UTC/GMT +8 hours)

4. Check Whether a Given Year is a Leap Year

Write a C++ program to check whether a given year is a leap year or not.

Sample Solution-1:

C++ Code:

#include <iostream> // Including the input/output stream library

using namespace std; // Using the standard namespace

// Function to check if a year is a leap year or not
bool is_leap_year(int year) {
    if (year % 400 == 0) // If the year is divisible by 400
        return true; // It's a leap year
    if (year % 100 == 0) // If the year is divisible by 100 but not by 400
        return false; // It's not a leap year
    if (year % 4 == 0) // If the year is divisible by 4 but not by 100
        return true; // It's a leap year
    return false; // If none of the above conditions match, it's not a leap year
}	

// Main function
int main() {
    int y; // Declaring an integer variable to store the year

    y = 1900; // Assigning a year value
    cout << "Is Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    y = 1999; // Assigning a year value
    cout << "\nIs Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    y = 2000; // Assigning a year value
    cout << "\nIs Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    y = 2010; // Assigning a year value
    cout << "\nIs Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    y = 2020; // Assigning a year value
    cout << "\nIs Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    return 0; // Return 0 to indicate successful execution
}

Sample Output:

Is Leap year: 1900?  Century of the year: 0
Is Leap year: 1999?  Century of the year: 0
Is Leap year: 2000?  Century of the year: 1
Is Leap year: 2010?  Century of the year: 0
Is Leap year: 2020?  Century of the year: 1

Flowchart:

Sample Solution-2:

C++ Code:

#include <iostream> // Including the input/output stream library

using namespace std; // Using the standard namespace

// Function to check if a year is a leap year or not
bool is_leap_year(int y) {
    return y % 400 == 0 || (y % 4 == 0 && y % 100 != 0); // Returns true if the year is divisible by 400 or divisible by 4 but not by 100
}	

// Main function
int main() {
    int y; // Declaring an integer variable to store the year

    y = 1900; // Assigning a year value
    cout << "Is Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    y = 1999; // Assigning a year value
    cout << "\nIs Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    y = 2000; // Assigning a year value
    cout << "\nIs Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    y = 2010; // Assigning a year value
    cout << "\nIs Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    y = 2020; // Assigning a year value
    cout << "\nIs Leap year: " << y << "?  Century of the year: " << is_leap_year(y); // Display the year and check if it's a leap year

    return 0; // Return 0 to indicate successful execution
}

Sample Output:

Is Leap year: 1900?  Century of the year: 0
Is Leap year: 1999?  Century of the year: 0
Is Leap year: 2000?  Century of the year: 1
Is Leap year: 2010?  Century of the year: 0
Is Leap year: 2020?  Century of the year: 1

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program that determines if a year is a leap year using the standard rules and outputs "Leap Year" or "Not a Leap Year."
Write a C++ program to check if a given year is a leap year by incorporating a function that validates century years correctly.
Write a C++ program that reads a list of years and prints which ones are leap years, using a loop and conditional statements.
Write a C++ program to check for leap years and also compute the number of days in February for the given year, outputting the result.

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