CODEWITHSUNDEEP
arrayskotlin
truthsayer
truthsayer

Reputation: 429

Kotlin Type mismatch: inferred type is Int? but Int was expected

I am trying to get the Maximum number between two numbers in Kotlin & I keep getting Type mismatch error. I tried using Int?.toInt() It didn't work.

I also tried to use Int!! as the double exclamation for None Null values, It didn't work too.

fun main(args: Array<String>){

    val nums = arrayOf(8, 5, 6, 8, 9)
    var sorted = arrayOfNulls<Int>(nums.size)

    // manually set 2 values
    sorted[0] = nums[0]
    sorted[1] = nums[1]

    for(i in 1 until nums.size-1){
        val value = sorted[i - 1]
        val max = maxOf(value!!, nums[i]) // This line throws Null pointer exception: error: type mismatch: inferred type is Int? but Int was expected
        // do something with max
    }

    println(sorted)
}

Upvotes: 6

Views: 22598

Answers (1)

tynn
tynn

Reputation: 39843

The arrayOfNulls() function is declared as

fun <reified T> arrayOfNulls(size: Int): Array<T?>

Thus any item of sorted might be null. So if you want to properly use it as null, just do a normal null check value != null before using it.

Instead of using nulls, you could also use Int.MIN_VALUE as initialization value.

val sorted = Array(nums.size) { MIN_VALUE }

Upvotes: 2

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