Factorial
import org.junit.Test
import kotlin.test.assertEquals
class FactorialTest {
@Test
fun `Test factorial results`() {
val numberWithFactorial = mapOf(
0 to 1L,
1 to 1L,
2 to 2L,
3 to 6L,
4 to 24L,
10 to 3628800L,
15 to 1307674368000L,
20 to 2432902008176640000L
)
for ((i, factorialResult) in numberWithFactorial) {
assertEquals(factorialResult, factorial(i))
}
}
}
// Your code starts here
//sampleStart
fun factorial(n: Int): Long = [mark]TODO()[/mark]
//sampleEnd
A factorial is a product of all the numbers from 0 to that number. For example factorial(5) = 5! = 5 * 4 * 3 * 2 * 1 = 120. More here.