Question

How to find the sum of all the multiples of 3 or 5 below 1000 in Kotlin

Answer 1

fun main() {
    var sum = 0

    // Iterate through numbers from 0 to 999
    for (x in 0 until 1000) {
        if (x % 3 == 0 || x % 5 == 0) {
            sum += x
        }
    }

    println(sum)
}

   
      
/*
run:

233168
  
*/

 

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Answer 2

fun main() {
    // Define the limit
    val limit = 999

    // Calculate the upper bounds
    val upperForThree = limit / 3
    val upperForFive = limit / 5
    val upperForFifteen = limit / 15

    // Calculate the sums using arithmetic series formula
    val sumThree = 3 * upperForThree * (1 + upperForThree) / 2
    val sumFive = 5 * upperForFive * (1 + upperForFive) / 2
    val sumFifteen = 15 * upperForFifteen * (1 + upperForFifteen) / 2

    // Calculate the total sum
    val totalSum = sumThree + sumFive - sumFifteen

    println(totalSum)
}

   
      
/*
run:

233168
  
*/

 

70+ SQL courses for beginners and professionals