# Kotlin program to calculate the sum of natural numbers

Kotlin | Sum of natural numbers: Here, we are going to learn how to calculate the sum of natural numbers in Kotlin programming language?
Submitted by IncludeHelp, on April 24, 2020

Given a number number, and we have to calculate the sum of all natural numbers from 1 to number.

Example:

```    Input:
number = 15

Output:
120
```

### Program to calculate the sum of natural numbers in Kotlin

```package com.includehelp.basic

import java.util.*

//Main Function entry Point of Program
fun main(args: Array<String>) {
//Input Stream
val scanner = Scanner(System.`in`)

//input integer number
print("Enter Number  : ")
val number: Int = scanner.nextInt()

var sum=0

//Iterate through loop to calculate sum
for(i in 1..number){
sum+=i
}

//Print Sum
println("Sum of All Natural Numbers up to \$number are : \$sum")
}
```

Output

```Run 1:
Enter Number  : 15
Sum of All Natural Numbers up to 15 are : 120
---
Run 2:
Enter Number  : 99
Sum of All Natural Numbers up to 99 are : 4950
---
Run 3:
Enter Number  : 456
Sum of All Natural Numbers up to 456 are : 104196
```