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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