C program to check if a Hexadecimal number is even or odd

C program to check if a Hexadecimal number is even or odd:

A number is called even if it is devisible by 2 and odd if it is not. This is same for a hexadecimal number as well. The trick is to check if a hexadecimal number can be divided by 2 or not.

In this post, we will write one C program that will check if a hexadecimal number is even or odd.

How to check if a Hexadecimal number is even/odd:

For any number, we can check its last digit and find out if it is even or odd. We can check if the last digit of a number is divisible by 2 or not. If it is divisible, it is an even number, else odd.

Hexadecimal numbers are 16 base numbers and one number is defined using 0 to 9 and A to F. We can say that a hexadecimal number is even if it ends with 0, 2, 4, 6, 8, A, C or E. A stands for 10, C stands for 12 and E for 14.

We can check the last value of a hexadecimal number and we can say it is odd or even.

C program for hexadecimal even/odd check:

Let’s write the program in C :

#include <stdio.h>
#include <string.h>

int isEven(char *hexa, int length)
{
    switch (hexa[length - 1])
    {
    case '0':
        return 1;
        break;
    case '2':
        return 1;
        break;
    case '4':
        return 1;
        break;
    case '6':
        return 1;
        break;
    case '8':
        return 1;
        break;
    case 'A':
        return 1;
        break;
    case 'C':
        return 1;
        break;
    case 'E':
        return 1;
        break;
    default:
        return -1;
        break;
    }
}
int main()
{
    char *thousand = "64E";
    if (isEven(thousand, strlen(thousand)) == -1)
    {
        printf("Odd Number");
    }
    else
    {
        printf("Even Number");
    }
}

Explanation:

In this program:

isEven method is used to check if a hexadecimal number is even or odd. It uses one switch statement to determine the last character.
length is the length of the string that we are passing to isEven method.
It returns -1 for odd numbers and 1 for even.

For the above program, it will print the below output:

Even Number

You can also try to run this program with different hexadecimal values and check the result.

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