Program to convert weeks to days

Given no of weeks. Write a program to convert weeks to days.

Examples:

Input: weeks = 4
Output: 28 days

Input: weeks = 2
Output: 14 days

Approach: To solve the problem, follow the below idea:

Since we know a week has 7 days. So, to find no of days in a week, we multiply weeks by 7.

1 week = 7 days
n weeks = n*7 days

Below is the implementation of the above approach:

C++

#include <iostream>
using namespace std;

int convertWeeksToDays(int weeks)
{
    if (weeks < 0)
        return -1;
    // Convert weeks to days (1 week = 7 days)
    return weeks * 7;
}

int main()
{
    int weeks = 9;

    int days = convertWeeksToDays(weeks);

    if (days == -1) {
        cout << "Invalid Input" << endl;
    }
    else {
        // Display the result
        cout << weeks << " weeks is equal to " << days
             << " days." << endl;
    }

    return 0;
}

Java

public class WeekToDayConverter {

    // Function to convert weeks to days
    public static int convertWeeksToDays(int weeks) {
        // Check for invalid input (negative weeks)
        if (weeks < 0) {
            return -1;
        }

        // Convert weeks to days (1 week = 7 days)
        return weeks * 7;
    }

    public static void main(String[] args) {
        // Given weeks
        int weeks = 9;

        // Call the function to convert weeks to days
        int days = convertWeeksToDays(weeks);

        // Check for invalid input and display the result
        if (days == -1) {
            System.out.println("Invalid Input");
        } else {
            System.out.println(weeks + " weeks is equal to " + days + " days.");
        }
    }
}

Python3

def convert_weeks_to_days(weeks):
    # Check for invalid input (negative weeks)
    if weeks < 0:
        return -1

    # Convert weeks to days (1 week = 7 days)
    return weeks * 7

if __name__ == "__main__":
    # Given weeks
    weeks = 9

    # Call the function to convert weeks to days
    days = convert_weeks_to_days(weeks)

    # Check for invalid input and display the result
    if days == -1:
        print("Invalid Input")
    else:
        print(f"{weeks} weeks is equal to {days} days.")

C#

using System;

class Program
{
    // Function to convert weeks to days
    static int ConvertWeeksToDays(int weeks)
    {
        if (weeks < 0)
            return -1;

        // Convert weeks to days (1 week = 7 days)
        return weeks * 7;
    }

    static void Main()
    {
        // Set the number of weeks
        int weeks = 9;

        // Call the function to convert weeks to days
        int days = ConvertWeeksToDays(weeks);

        if (days == -1)
        {
            Console.WriteLine("Invalid Input");
        }
        else
        {
            // Display the result
            Console.WriteLine($"{weeks} weeks is equal to {days} days.");
        }
    }
}

Javascript

// Function to convert weeks to days
function convertWeeksToDays(weeks) {
    if (weeks < 0)
        return -1;

    // Convert weeks to days (1 week = 7 days)
    return weeks * 7;
}

// Main function
function main() {
    const weeks = 9;

    const days = convertWeeksToDays(weeks);

    if (days === -1) {
        console.log("Invalid Input");
    } else {
        // Display the result
        console.log(`${weeks} weeks is equal to ${days} days.`);
    }
}

// Execute the main function
main();

Output

9 weeks is equal to 63 days.

Time Complexity: O(1)
Auxiliary space: O(1)