**Any integer that is divisible by 2 is called even number. For example: 2,4,6,20 etc. are even numbers.**

__Even Number:__**Any integer that is not divisible by 2, is called odd number. For example: 1, 3, 5, 7, 9 etc. are odd numbers.**

__Odd Number:__
In C/C++ or Java language, we can check whether a number is even or odd by using modulus operator. If an integer mod 2 is 0 then, it is even and if an integer mod 2 is 1 then, it is an odd number.

Even or Odd number can be tested by bitwise operator too. Bitwise & ( AND ) operator can be used to check for even or odd. If ANDing an integer by 1 results 1 then the integer is ODD else ( result 0 ) the integer is EVEN. But how does it work? Let's have a look at couple of examples. Let's take 9 as odd number and 14 as even number.

__For 9:__

9 -> 1 0 0 1 1 -> & 0 0 0 1 ------------------- result-> 0 0 0 1

So 9 AND 1 gives us 1, as the right most bit of every odd number is 1.

__For 14:__

14 -> 1 1 1 0 1 -> & 0 0 0 1 ------------------ result-> 0 0 0 0

So 14 AND 1 gives us 0, as the right most bit of every even number is 0.

####
__C Programming Implementation:__

#include <stdio.h> int main() { int x; printf("Enter a number: "); scanf("%d", &x); if(x&1) printf("%d is ODD\n", x); else printf("%d is EVEN\n", x); return 0; }