How can I update the "count" within my Kotlin app

My app is relatively simple and consists of primarily 3 things: a count, and two buttons to decrement/increment the count. I am unsure if my method of editing the count is out of scope or if the UI needs to be forced to update. Below are the 50 lines of logic.

@Composable
fun DiceWithButtonAndImage(modifier: Modifier = Modifier) {
    var count = 3 // Int
    Column(
        modifier = modifier,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        Image(painter = painterResource(R.drawable.android_robot_svg), contentDescription = "1")
        Spacer(modifier = Modifier.height(16.dp))
        Text("Current count: $count")
        Row() {
            Text("Jackson Perry", fontWeight = FontWeight.Bold)
            Text("(CS 492)")
        }
        Row() {
            Button(onClick = { count = when(count) {
                1 -> 5
                2 -> 1
                3 -> 2
                4 -> 3
                5 -> 4
                else -> 0
            } }) {
                Text(stringResource(R.string.prev))
            }
            Button(onClick = { count = when(count) {
                1 -> 2
                2 -> 3
                3 -> 4
                4 -> 5
                5 -> 1
                else -> 0
            } }) {
                Text(stringResource(R.string.next))
            }
        }

    }
}

The UI is appearing as intended, yet the buttons seem to have no effect. Here is how it appears

To make a variable's change in value stick, you have to remember it. To cause the UI to update after a variable is changed, you have to make the variable use State. So, you need to do both. Change

var count = 3

to

var count: Int by remember { mutableStateOf(3) }

and it will work. Using by instead of = makes the State a variable delegate so you can directly change its value without having to use .value each time.

By the way, you should avoid ever using when statements for handling every possible math condition. You're a programmer, so make the computer do the calculations for you!

This code that decrements the count:

count = when(count) {
  1 -> 5
  2 -> 1
  3 -> 2
  4 -> 3
  5 -> 4
  else -> 0
}

could be

count--
if (count == 0) count = 5

or, if you're comfortable with the remainder operator it could be:

count = ((count + 3) % 5) + 1

Like wise the incrementing code could be

count++
if (count == 6) count = 1

or

count = (count % 5) + 1

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