There is no single command or function in C that can check if a number is odd or even. However, this can be accomplished by dividing that number by 2, then checking the remainder. If the remainder is 0, then that number is even, otherwise, it is odd. You can write it in code as:
printf("Enter any integer: ");
if(number % 2 ==0)
printf("%d is even number.",number);
printf("%d is odd number.",number);
Enter any integer: 5
5 is odd number.