Write a C++ program to calculate the sum of first n natural number, where n is entered by user.

Write a C++ program to calculate the sum of first n natural number, where n is entered by user. 

Program Code:
#include <iostream>
using namespace std;
int main()
{ 
int i;   
int number, sum = 0;   
cout << "Enter a positive integer to calculate the sum is : ";   
cin >> number;  
for (i = 1; i <= number; i++) 
{      
sum = sum + i;  
}   
cout << " Sum of first n natural number = " ;
cout<< sum;   
return 0;
}

The program output is tested on www.jdoodle.com

Output:
Enter a positive integer to calculate the sum is : 7
Sum of first n natural number = 28


Thanks
Mukesh Rajput