**Odd-Even program in C:**

An even number is perfectly divisible by 2, whereas an odd number is not perfectly divisible by 2.

We use this logic to check if a number is even or odd.

The below code checks if the integer entered by the user is even or odd:

```
#include <stdio.h>
int main()
{
int number;
printf("Enter an integer: ");
scanf("%d", & amp; number);
if (number % 2 == 0)
printf("%d is even.", number);
else
printf("%d is odd.", number);
return 0;
}
```

- We have created an integer variable
to store the user input.*number* - We are checking if the integer entered by the user is perfectly divisible by 2 or not. If it is, then it is an even number; else, it is an odd number.
- We use the modulus operator to check for divisibility. If a%b is equal to 0, it implies that a is perfectly divisible by b.

We run the code for different inputs and get the outputs accordingly.

Some inputs and outputs for the code are:

```
Enter an integer: 4
4 is even.
Enter an integer: 5
5 is odd.
Enter an integer: -54
-54 is even.
Enter an integer: 12223
12223 is odd.
```

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