Write a function to determine if a given input number is even

Problem Statement

IsEven? Write a function to find whether the given input number is Even. If the given number is even, the function should return 2 else it should return 1. Note: The number passed to the function can either be negative, positive or zero. Zero should be treated as Even.

Sample Input/Output

Sample Input  Sample Output  4  2  -3  1  6  2  7  1

Algorithm

1. Start
2. Read the input number
3. Check if the number is even (number % 2 == 0)
4. If even, return 2
5. If odd, return 1
6. End

C Programming:

Objective: This C function determines if a given number is even and returns 2 for even numbers and 1 for odd numbers. It handles negative, positive, and zero values.

#include <stdio.h>

// Function to determine if number is even
int isEven(int input1) {
    if (input1 % 2 == 0)
        return 2;
    else
        return 1;
}

int main() {
    int input1;
    printf("Enter a number: ");
    scanf("%d", &input1);
    printf("Result: %d\n", isEven(input1));
    return 0;
}

Input/Output:

Enter a number: 4 Result: 2

C++ Programming:

Objective: This C++ function determines if a given number is even and returns 2 for even numbers and 1 for odd numbers. It handles negative, positive, and zero values.

#include <iostream>

// Function to determine if number is even
int isEven(int input1) {
    if (input1 % 2 == 0)
        return 2;
    else
        return 1;
}

int main() {
    int input1;
    std::cout << "Enter a number: ";
    std::cin >> input1;
    std::cout << "Result: " << isEven(input1) << std::endl;
    return 0;
}

Input/Output:

Enter a number: 7 Result: 1

Java Programming:

Objective: This Java function determines if a given number is even and returns 2 for even numbers and 1 for odd numbers. It handles negative, positive, and zero values.

import java.io.*;
import java.util.*;

class UserMainCode {
    public int isEven(int input1) {
        if (input1 % 2 == 0)
            return 2;
        else
            return 1;
    }
}

Input/Output:

Enter a number: 6 Result: 2

Python Programming:

Objective: IThis Python function determines if a given number is even and returns 2 for even numbers and 1 for odd numbers. It handles negative, positive, and zero values.

# Function to determine if number is even
def is_even(input1):
    if input1 % 2 == 0:
        return 2
    else:
        return 1

if __name__ == "__main__":
    input1 = int(input("Enter a number: "))
    print("Result:", is_even(input1))

Input/Output:

Enter a number: -3 Result: 1

FAQs

How does this function handle negative numbers?

• The function checks if a number is even by using the modulus operator. Negative numbers can also be even or odd, so the same logic applies.

What is the significance of returning 2 for even and 1 for odd numbers?

• This is a specific requirement for the function. It could easily be modified to return other values, but the essence is to distinguish even and odd numbers.

Is zero considered even?

• Yes, zero is considered an even number because it is divisible by 2.

Can this function be implemented in other programming languages?

• Absolutely, the logic is simple and can be translated into any programming language.

Why use the modulus operator to check for even numbers?

• The modulus operator (%) returns the remainder of a division. For even numbers, the remainder when divided by 2 is zero.

What happens if the input is not a number?

• The function assumes the input is a valid integer. In a practical implementation, input validation would be necessary to handle non-numeric inputs.