In this example, if...else statement is used to check whether a number entered by the user is even or odd.

To understand this example, you should have the knowledge of following C programming topics:

An even number is an integer that is exactly divisible by 2. Example: 0, 8, -24

An odd number is an integer that is not exactly divisible by 2. Example: 1, 7, -11, 15

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

**Output**

Enter an integer: -7 -7 is odd.

In the program, integer entered by the user is stored in variable `number`.

Then, whether the number is perfectly divisible by 2 or not is checked using modulus operator.

If the number is perfectly divisible by 2, test expression `number%2 == 0`

evaluates to 1 (true) and the number is even.

However, if the test expression evaluates to 0 (false), the number is odd.

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