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C Program to Check Even Number

Posted in C Tutorial
Updated on Oct 06, 2024
By Mari Selvan
πŸ‘οΈ 242 - Views
⏳ 4 mins
πŸ’¬ 1 Comment
C Program to Check Even Number

Photo Credit to CodeToFun

πŸ™‹ Introduction

In the realm of programming, dealing with numbers is a fundamental task. One common requirement is checking whether a given number is even or not. An even number is an integer that is exactly divisible by 2 without leaving a remainder.

In this tutorial, we will explore a C program designed to check whether a given number is even. The program involves using the modulo operator to determine if the number is divisible by 2.

πŸ“„ Example

Let's delve into the C code that accomplishes this task.

isEven.c
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#include <stdio.h>

// Function to check if a number is even
int isEven(int number) {
  // If the remainder is zero, the number is even
  return number % 2 == 0;
}

// Driver program
int main() {
  // Replace this value with the number you want to check
  int number = 10;

  // Call the function to check if the number is even
  if (isEven(number))
    printf("%d is an even number.\n", number);
  else
    printf("%d is not an even number.\n", number);

  return 0;
}

πŸ’» Testing the Program

To test the program with different numbers, modify the value of number in the main program.

Output
10 is an even number.

🧠 How the Program Works

  1. The program defines a function isEven that takes an integer number as input and returns 1 (true) if the number is even, and 0 (false) otherwise.
  2. Inside the main program, replace the value of number with the desired number you want to check.
  3. The program calls the isEven function and prints the result.

πŸ“ Between the Given Range

Let's delve into the C code that accomplishes the task.

isEven.c
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#include <stdio.h>

// Function to check if a number is even
int isEven(int num) {
  return (num % 2 == 0);
}

// Function to check even numbers in a range
void checkEvenNumbersInRange(int start, int end) {
  printf("Even numbers in the range %d to %d:\n", start, end);

  for (int i = start; i <= end; ++i) {
    if (isEven(i)) {
      printf("%d ", i);
    }
  }

  printf("\n");
}

// Driver program
int main() {
  // Range of numbers
  int start = 1;
  int end = 10;

  // Call the function to check even numbers in the range
  checkEvenNumbersInRange(start, end);

  return 0;
}

πŸ’» Testing the Program

Output
Even numbers in the range 1 to 10:
2 4 6 8 10

Compile and run the program to see the even numbers in the specified range.

🧠 How the Program Works

  1. The program defines a function isEven that checks whether a given number is even.
  2. It then defines a function checkEvenNumbersInRange that prints even numbers within a specified range.
  3. The main function sets the range from 1 to 10 and calls the function to check even numbers.

🧐 Understanding the Concept of Even Number

Before delving into the code, let's understand the concept of even numbers. An even number is an integer that is exactly divisible by 2.

In other words, when an even number is divided by 2, the remainder is zero.

🎒 Optimizing the Program

While the provided program is straightforward, consider exploring and implementing alternative approaches or optimizations for checking even numbers.

Feel free to incorporate and modify this code as needed for your specific use case. Happy coding!

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Author

author
πŸ‘‹ Hey, I'm Mari Selvan

For over eight years, I worked as a full-stack web developer. Now, I have chosen my profession as a full-time blogger at codetofun.com.

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Mari Selvan
Mari Selvan
11 months ago

If you have any doubts regarding this article (C Program to Check Even Number) please comment here. I will help you immediately.

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