Kotlin Program to Calculate the Sum of Natural Numbers

In this article, we will understand how to calculate the sum of natural numbers in Kotlin. All possible positive numbers from 1 to infinity are called natural numbers.

Below is a demonstration of the same ?

Suppose our input is

1 and 100

The desired output would be ?

Sum of natural numbers from 1 to 100 is 3825

Algorithm

• Step 1 ? Start

• Step 2 ? Declare an integers input

• Step 3 ? Define the integers

• Step 4 ? Run a for-loop, add the number with its next number until the upper limit is reached. Store the sum in the variable myResult.

• Step 5 ? Display myResult

• Step 6 ? Stop

Example 1

In this example, we will calculate the Sum of Natural Numbers using a for loop. First, declare and set a variable for input ?

val input = 100

Set another variable and initialize to 0. This variable with display the sum later on ?

var myResult = 0

Now, use the for loop to calculate the sum of natural numbers ?

for (i in 1..input) {
   myResult += i
}

Let us now see the complete example to get the sum of natural numbers using for loop ?

fun main() {
   val input = 100
   println("The N value is defined as $input")
   
   var myResult = 0
   
   for (i in 1..input) {
      myResult += i
   }
   println("The sum of N natural numbers is $myResult")
}

Output

The N value is defined as 100
The sum of N natural numbers is 5050

Example 2

In this example, we will calculate the Sum of Natural Numbers ?

fun main() {
   val input = 100
   println("The N value is defined as $input")
   sum(input)
}
fun sum(input: Int) {
   var myResult = 0
   for (i in 1..input) {
      myResult += i
   }
   println("The sum of N natural numbers is $myResult")
}

Output

The N value is defined as 100
The sum of N natural numbers is 5050