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# Check whether a given number is even or odd

In this article, we will discuss a simple C program to determine whether a given integer is even or odd. We will first understand the problem statement and then proceed to explain the code to check for even or odd numbers. We will provide a suitable example to demonstrate the working of the program and analyze its time complexity.

## Problem Statement

The task is to write a C program that takes an integer as input and checks whether it is an even or an odd number. An even number is any integer that can be exactly divided by 2, resulting in a remainder of 0, while an odd number will have a remainder of 1 when divided by 2.

## Example

Let's consider the number 12. Its binary representation is 1100. Since the last bit (least significant bit) is 0, it is an even number. On the other hand, the number 7 has a binary representation of 111, with the last bit being 1, making it an odd number.

## Pseudocode

To check whether a given number is even or odd, we can use the modulo operator (%) to find the remainder when the number is divided by 2. If the remainder is 0, the number is even, and if the remainder is 1, the number is odd.

``````checkEvenOdd(num)
if num % 2 == 0
print "Is Even Number"
else
print "Is Odd Number"
``````

## Algorithm

1. Start the program and define the function checkEvenOdd(num).
2. Display the given number using the printf() function.
3. Check whether the number is even or odd using the condition num % 2 == 0.
4. If the condition is true, print "Is Even Number"; otherwise, print "Is Odd Number".
6. Test the checkEvenOdd function with various test cases.

## Explanation

The provided C program begins with a function checkEvenOdd(num) that takes an integer num as input. The function prints the given number and then checks if the number is even or odd using the condition num % 2 == 0. The modulo operator % calculates the remainder when num is divided by 2. If the remainder is 0, the number is even, and "Is Even Number" is printed; otherwise, "Is Odd Number" is printed.

Test Cases:

1. Test Case: checkEvenOdd(12) Output: Number: 12, Is Even Number

2. Test Case: checkEvenOdd(34) Output: Number: 34, Is Even Number

3. Test Case: checkEvenOdd(-12) Output: Number: -12, Is Even Number

4. Test Case: checkEvenOdd(7) Output: Number: 7, Is Odd Number

5. Test Case: checkEvenOdd(21) Output: Number: 21, Is Odd Number

6. Test Case: checkEvenOdd(-11) Output: Number: -11, Is Odd Number

## Code Solution

Here given code implementation process.

``````// C Program
// Check whether a given number is even or odd
#include <stdio.h>
// Determine whether given number is Even or Odd
void checkEvenOdd(int num)
{
// Display given number
printf("\n Number : %d", num);
if (num % 2 == 0)
{
// When last bit is not set
printf("\n Is Even Number \n");
}
else
{
printf("\n Is Odd Number\n");
}
}
int main(int argc, char
const *argv[])
{
// Test Cases
// 12 (1100)
checkEvenOdd(12);
// 34 (100010)
checkEvenOdd(34);
// -12 (∞11110100)
checkEvenOdd(-12);
// 7 (111)
checkEvenOdd(7);
// 21 (00010101)
checkEvenOdd(21);
// -11 (11110101)
checkEvenOdd(-11);
return 0;
}``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````
``````/*
Java Program
Check whether a given number is even or odd
*/
public class Comparison
{
// Determine whether given number is Even or Odd
public void checkEvenOdd(int num)
{
// Display given number
System.out.print("\n Number : " + num );
if (num % 2 == 0)
{
// When last bit is not set
System.out.print("\n Is Even Number \n");
}
else
{
System.out.print("\n Is Odd Number\n");
}
}
public static void main(String[] args)
{
// Test Cases
// 12 (1100)
// 34 (100010)
// -12 (∞11110100)
// 7 (111)
// 21 (00010101)
// -11 (11110101)
}
}``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````
``````// Include header file
#include <iostream>

using namespace std;
/*
C++ Program
Check whether a given number is even or odd
*/
class Comparison
{
public:
// Determine whether given number is Even or Odd
void checkEvenOdd(int num)
{
// Display given number
cout << "\n Number : " << num;
if (num % 2 == 0)
{
// When last bit is not set
cout << "\n Is Even Number \n";
}
else
{
cout << "\n Is Odd Number\n";
}
}
};
int main()
{
// Test Cases
// 12 (1100)
// 34 (100010)
// -12 (∞11110100)
// 7 (111)
// 21 (00010101)
// -11 (11110101)
return 0;
}``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````
``````// Include namespace system
using System;
/*
C# Program
Check whether a given number is even or odd
*/
public class Comparison
{
// Determine whether given number is Even or Odd
public void checkEvenOdd(int num)
{
// Display given number
Console.Write("\n Number : " + num);
if (num % 2 == 0)
{
// When last bit is not set
Console.Write("\n Is Even Number \n");
}
else
{
Console.Write("\n Is Odd Number\n");
}
}
public static void Main(String[] args)
{
// Test Cases
// 12 (1100)
// 34 (100010)
// -12 (∞11110100)
// 7 (111)
// 21 (00010101)
// -11 (11110101)
}
}``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````
``````<?php
/*
Php Program
Check whether a given number is even or odd
*/
class Comparison
{
// Determine whether given number is Even or Odd
public	function checkEvenOdd(\$num)
{
// Display given number
echo "\n Number : ". \$num;
if (\$num % 2 == 0)
{
// When last bit is not set
echo "\n Is Even Number \n";
}
else
{
echo "\n Is Odd Number\n";
}
}
}

function main()
{
// Test Cases
// 12 (1100)
// 34 (100010)
// -12 (∞11110100)
// 7 (111)
// 21 (00010101)
// -11 (11110101)
}
main();``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````
``````/*
Node Js Program
Check whether a given number is even or odd
*/
class Comparison
{
// Determine whether given number is Even or Odd
checkEvenOdd(num)
{
// Display given number
process.stdout.write("\n Number : " + num);
if (num % 2 == 0)
{
// When last bit is not set
process.stdout.write("\n Is Even Number \n");
}
else
{
process.stdout.write("\n Is Odd Number\n");
}
}
}

function main()
{
// Test Cases
// 12 (1100)
// 34 (100010)
// -12 (∞11110100)
// 7 (111)
// 21 (00010101)
// -11 (11110101)
}
main();``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````
``````#   Python 3 Program
#   Check whether a given number is even or odd

class Comparison :
#  Determine whether given number is Even or Odd
def checkEvenOdd(self, num) :
#  Display given number
print("\n Number : ", num, end = "")
if (num % 2 == 0) :
#  When last bit is not set
print("\n Is Even Number ")
else :
print("\n Is Odd Number")

def main() :
#  Test Cases
#  12 (1100)
#  34 (100010)
#  -12 (∞11110100)
#  7 (111)
#  21 (00010101)
#  -11 (11110101)

if __name__ == "__main__": main()``````

#### Output

`````` Number :  12
Is Even Number

Number :  34
Is Even Number

Number :  -12
Is Even Number

Number :  7
Is Odd Number

Number :  21
Is Odd Number

Number :  -11
Is Odd Number``````
``````#   Ruby Program
#   Check whether a given number is even or odd

class Comparison
#  Determine whether given number is Even or Odd
def checkEvenOdd(num)
#  Display given number
print("\n Number : ", num)
if (num % 2 == 0)
#  When last bit is not set
print("\n Is Even Number \n")
else
print("\n Is Odd Number\n")
end

end

end

def main()
#  Test Cases
#  12 (1100)
#  34 (100010)
#  -12 (∞11110100)
#  7 (111)
#  21 (00010101)
#  -11 (11110101)
end

main()``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number
``````
``````/*
Scala Program
Check whether a given number is even or odd
*/
class Comparison
{
// Determine whether given number is Even or Odd
def checkEvenOdd(num: Int): Unit = {
// Display given number
print("\n Number : " + num);
if (num % 2 == 0)
{
// When last bit is not set
print("\n Is Even Number \n");
}
else
{
print("\n Is Odd Number\n");
}
}
}
object Main
{
def main(args: Array[String]): Unit = {
var task: Comparison = new Comparison();
// Test Cases
// 12 (1100)
// 34 (100010)
// -12 (∞11110100)
// 7 (111)
// 21 (00010101)
// -11 (11110101)
}
}``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````
``````/*
Swift 4 Program
Check whether a given number is even or odd
*/
class Comparison
{
// Determine whether given number is Even or Odd
func checkEvenOdd(_ num: Int)
{
// Display given number
print("\n Number : ", num, terminator: "");
if (num % 2 == 0)
{
// When last bit is not set
print("\n Is Even Number ");
}
else
{
print("\n Is Odd Number");
}
}
}
func main()
{
// Test Cases
// 12 (1100)
// 34 (100010)
// -12 (∞11110100)
// 7 (111)
// 21 (00010101)
// -11 (11110101)
}
main();``````

#### Output

`````` Number :  12
Is Even Number

Number :  34
Is Even Number

Number :  -12
Is Even Number

Number :  7
Is Odd Number

Number :  21
Is Odd Number

Number :  -11
Is Odd Number``````
``````/*
Kotlin Program
Check whether a given number is even or odd
*/
class Comparison
{
// Determine whether given number is Even or Odd
fun checkEvenOdd(num: Int): Unit
{
// Display given number
print("\n Number : " + num);
if (num % 2 == 0)
{
// When last bit is not set
print("\n Is Even Number \n");
}
else
{
print("\n Is Odd Number\n");
}
}
}
fun main(args: Array < String > ): Unit
{
// Test Cases
// 12 (1100)
// 34 (100010)
// -12 (∞11110100)
// 7 (111)
// 21 (00010101)
// -11 (11110101)
}``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````
``````// Rust Program
// Check whether a given number is even or odd
fn main()
{
// Test Cases
// 12 (1100)
check_even_odd(12);
// 34 (100010)
check_even_odd(34);
// -12 (∞11110100)
check_even_odd(-12);
// 7 (111)
check_even_odd(7);
// 21 (00010101)
check_even_odd(21);
// -11 (11110101)
check_even_odd(-11);
}
fn check_even_odd(num: i32)
{
// Display given number
print!("\n Number : {}", num);
if num % 2 == 0
{
// When last bit is not set
print!("\n Is Even Number \n");
}
else
{
print!("\n Is Odd Number\n");
}
}``````

#### Output

`````` Number : 12
Is Even Number

Number : 34
Is Even Number

Number : -12
Is Even Number

Number : 7
Is Odd Number

Number : 21
Is Odd Number

Number : -11
Is Odd Number``````

## Resultant Output Explanation

The program provides the expected output for each test case. The numbers 12, 34, and -12 are even, and the program correctly identifies them as even numbers. Similarly, the numbers 7, 21, and -11 are odd, and the program identifies them correctly as odd numbers.

## Time Complexity

The time complexity of this program is constant, O(1), as it performs a fixed number of operations regardless of the input value. The program involves basic arithmetic operations and a conditional check, which takes a constant amount of time to execute. Thus, the time complexity remains constant, making the program efficient for any input size.

## Finally

: In this article, we discussed a C program to check whether a given number is even or odd. We provided an explanation of the problem statement, pseudocode, algorithm, and the resultant output for various test cases. The program has a time complexity of O(1), ensuring efficient execution regardless of the input value. Understanding the concept of even and odd numbers and implementing the code to check them is essential for any beginner learning programming in C or similar languages.

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