# Sum of n natural numbers

Here given code implementation process.

```
// C Program
// Sum of n natural numbers
#include <stdio.h>
//Calculate the sum of n natural numbers
void sum_natural_no(int n)
{
if (n <= 0)
{
return;
}
// Formula
// n*(n+1) / 2
long long int sum = n *(n + 1) / 2;
//Display calculated result
printf(" Sum of %d natural numbers is %lld\n", n, sum);
}
int main()
{
//Test case
sum_natural_no(4);
sum_natural_no(10);
return 0;
}
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
// Java Program
// Sum of n natural numbers
class MyMaths
{
//Calculate the sum of n natural numbers
public void sum_natural_no(int n)
{
if (n <= 0)
{
return;
}
// Formula
// n*(n+1) / 2
long sum = n * (n + 1) / 2;
//Display calculated result
System.out.print(" Sum of " + n + " natural numbers is " + sum + "\n");
}
public static void main(String[] args)
{
MyMaths obj = new MyMaths();
//Test case
obj.sum_natural_no(4);
obj.sum_natural_no(10);
}
}
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
//Include header file
#include <iostream>
using namespace std;
// C++ Program
// Sum of n natural numbers
class MyMaths
{
public:
//Calculate the sum of n natural numbers
void sum_natural_no(int n)
{
if (n <= 0)
{
return;
}
// Formula
// n*(n+1) / 2
long sum = n * (n + 1) / 2;
//Display calculated result
cout << " Sum of " << n << " natural numbers is " << sum << "\n";
}
};
int main()
{
MyMaths obj = MyMaths();
//Test case
obj.sum_natural_no(4);
obj.sum_natural_no(10);
return 0;
}
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
//Include namespace system
using System;
// C# Program
// Sum of n natural numbers
class MyMaths
{
//Calculate the sum of n natural numbers
public void sum_natural_no(int n)
{
if (n <= 0)
{
return;
}
// Formula
// n*(n+1) / 2
long sum = n * (n + 1) / 2;
//Display calculated result
Console.Write(" Sum of " + n + " natural numbers is " + sum + "\n");
}
public static void Main(String[] args)
{
MyMaths obj = new MyMaths();
//Test case
obj.sum_natural_no(4);
obj.sum_natural_no(10);
}
}
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
<?php
// Php Program
// Sum of n natural numbers
class MyMaths
{
//Calculate the sum of n natural numbers
public function sum_natural_no($n)
{
if ($n <= 0)
{
return;
}
// Formula
// n*(n+1) / 2
$sum = intval($n * ($n + 1) / 2);
//Display calculated result
echo " Sum of ". $n ." natural numbers is ". $sum ."\n";
}
}
function main()
{
$obj = new MyMaths();
//Test case
$obj->sum_natural_no(4);
$obj->sum_natural_no(10);
}
main();
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
// Node Js Program
// Sum of n natural numbers
class MyMaths
{
//Calculate the sum of n natural numbers
sum_natural_no(n)
{
if (n <= 0)
{
return;
}
// Formula
// n*(n+1) / 2
var sum = parseInt(n * (n + 1) / 2);
//Display calculated result
process.stdout.write(" Sum of " + n + " natural numbers is " + sum + "\n");
}
}
function main()
{
var obj = new MyMaths();
//Test case
obj.sum_natural_no(4);
obj.sum_natural_no(10);
}
main();
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
# Python 3 Program
# Sum of n natural numbers
class MyMaths :
# Calculate the sum of n natural numbers
def sum_natural_no(self, n) :
if (n <= 0) :
return
# Formula
# n*(n+1) / 2
sum = int(n * (n + 1) / 2)
# Display calculated result
print(" Sum of ", n ," natural numbers is ", sum )
def main() :
obj = MyMaths()
# Test case
obj.sum_natural_no(4)
obj.sum_natural_no(10)
if __name__ == "__main__": main()
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
# Ruby Program
# Sum of n natural numbers
class MyMaths
# Calculate the sum of n natural numbers
def sum_natural_no(n)
if (n <= 0)
return
end
# Formula
# n*(n+1) / 2
sum = n * (n + 1) / 2
# Display calculated result
print(" Sum of ", n ," natural numbers is ", sum ,"\n")
end
end
def main()
obj = MyMaths.new()
# Test case
obj.sum_natural_no(4)
obj.sum_natural_no(10)
end
main()
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
// Scala Program
// Sum of n natural numbers
class MyMaths
{
//Calculate the sum of n natural numbers
def sum_natural_no(n: Int): Unit = {
if (n <= 0)
{
return;
}
// Formula
// n*(n+1) / 2
var sum: Long = (n * (n + 1) / 2).toInt;
//Display calculated result
print(" Sum of " + n + " natural numbers is " + sum + "\n");
}
}
object Main
{
def main(args: Array[String]): Unit = {
var obj: MyMaths = new MyMaths();
//Test case
obj.sum_natural_no(4);
obj.sum_natural_no(10);
}
}
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

```
// Swift Program
// Sum of n natural numbers
class MyMaths
{
//Calculate the sum of n natural numbers
func sum_natural_no(_ n: Int)
{
if (n <= 0)
{
return;
}
// Formula
// n*(n+1) / 2
let sum: Int = n * (n + 1) / 2;
//Display calculated result
print(" Sum of ", n ," natural numbers is ", sum );
}
}
func main()
{
let obj: MyMaths = MyMaths();
//Test case
obj.sum_natural_no(4);
obj.sum_natural_no(10);
}
main();
```

#### Output

```
Sum of 4 natural numbers is 10
Sum of 10 natural numbers is 55
```

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