even_odd function 

1. Definition:

An integer is odd if it is not divided by two. Otherwise, 
it is even. 13 is odd, but 12 is even ..


2. The method in C language:

#include <stdio.h>

 /* Declaring  an enumeration data type of name BOOLEAN */
enum BOOLEAN {false, true };


int is_odd ( int x){
if((x % 2) == 0)
return false;
else
return true;
}



int main()
{
int number;

printf("\n Enter a positive integer: --> ");
scanf("%d", &number);


if(is_odd(number))
	printf("\n The number %d is odd. \n", number);

else
	printf("\n The number %d is even. \n", number);


return 0;
}