## Example 1: Count Number of Digits in an Integer

```
fun main(args: Array<String>) {
var count = 0
var num = 1234567
while (num != 0) {
num /= 10
++count
}
println("Number of digits: $count")
}
```

When you run the program, the output will be:

Number of digits: 7

In this program, while loop is iterated until the test expression `num != 0`

is evaluated to 0 (false).

- After first iteration,
`num`will be divided by 10 and its value will be 345. Then, the`count`is incremented to 1. - After second iteration, the value of
`n`um will be 34 and the`count`is incremented to 2. - After third iteration, the value of
`num`will be 3 and the`count`is incremented to 3. - After fourth iteration, the value of
`num`will be 0 and the`count`is incremented to 4. - Then the test expression is evaluated to false and the loop terminates.

Here's the equivalent Java code: Java Program to Count Number of Digits in an Integer