C Program to Check if a Number is Even or Odd

This C program uses a simple if-else statement to check whether a given number is even or odd. The program takes an integer input from the user and checks its remainder when divided by 2. If the remainder is 0, the number is even; otherwise, it's odd.

Code Implementation

// C Program to Check if a Number is Even or Odd

#include <stdio.h>

int main() {
    int num;

    // Ask the user to enter a number
    printf("Enter a number: ");
    scanf("%d", &num);

    // Check if the number is even or odd
    if (num % 2 == 0) {
        printf("%d is an even number.", num);
    } else {
        printf("%d is an odd number.", num);
    }

    return 0;
}

How the Program Works

The program uses the modulus operator (%) to find the remainder of the number when divided by 2. If the remainder is 0, the number is even; otherwise, it's odd.

Example Use Cases

Here are some example inputs and outputs of the program:

// Example 1: Even number
Enter a number: 10
10 is an even number.

// Example 2: Odd number
Enter a number: 11
11 is an odd number.

Tips and Variations

Here are some tips and variations to enhance the program:

* Use a function to check if a number is even or odd, and call the function from the main function. * Use a switch statement instead of if-else to check if a number is even or odd. * Use a ternary operator to simplify the code. * Add input validation to handle invalid inputs, such as non-integer values.

FAQs

Here are some frequently asked questions about the program:

Q: What is the purpose of the modulus operator (%) in the program?

A: The modulus operator (%) is used to find the remainder of the number when divided by 2. This helps to determine whether the number is even or odd.

Q: Can I use a switch statement instead of if-else in the program?

A: Yes, you can use a switch statement instead of if-else to check if a number is even or odd. However, the switch statement is not as efficient as the if-else statement in this case.

Q: How can I add input validation to the program?

A: You can add input validation to the program by checking if the input is a valid integer. You can use the scanf function to check if the input is a valid integer, and handle invalid inputs accordingly.