In this tutorial, you shall learn how to write a program to find the product of digits in a given number in Kotlin.

## Kotlin – Product of Digits Program

To find the product of digits in a given number in Kotlin, iterate over the digits of the number, and accumulate the product.

To iterate over the digits of a number, you can use while loop statement, where we divide the number by 10, and get the remainder, which is a digit from the number, and then update the number with the quotient of given number divided by 10.

## Program

In the following program, we read a number from user and store it in `num`, then find the product of the digits in the number, and finally print the product to output.

Main.kt

```fun main() {
print("Enter an integer : ")
val num = readLine()!!.toInt()

var sum = 0
var temp = num
while (temp != 0) {
val digit = temp % 10
sum += digit
temp /= 10
}

println("The sum of digits in \$num is \$sum.")
}```

Output #1

```Enter an integer : 412
The product of digits in 412 is 8.```

Output #2

```Enter an integer : 123456789
The product of digits in 123456789 is 362880.```

Output #3

```Enter an integer : 10236
The product of digits in 10236 is 0.```