C++ Program to Calculate Sum of Natural Numbers

Write a C++ program to calculate the sum of natural numbers. To write this program we will use for loop.

The sum of natural numbers is calculated as 1+2+3+4+….+N, or you can directly use formula N(N+1)/2. Using formula developing C++ program is too much easy so lets us develop C++ program using loop to calculate sum = 1+2+3+4+….+N. You can use either for loop or while loop or do-while loop for this purpose.

// C++ program to Calculate sum of Natural numbers
#include<iostream>
using namespace std;
int main()
{
  // declare variable
  int n, i, sum=0;

  // take input
  cout << "Enter the N value: ";
  cin >> n;

  // Calculate sum
  for (i = 1; i <= n; i++)
  {
    sum += i; // sum = sum + i;
  }

  // display result
  cout << "Sum= " << sum << endl;

  return 0;
}

Output:-

Enter the N value: 10
Sum= 55

Write a Program to Print First 10 Natural Numbers in C++

// C++ program to Calculate sum of Natural numbers
#include<iostream>
using namespace std;
int main()
{
  // declare variable
  int sum=0;

  // calculate sum
  for (int i = 1; i <= 10; i++)
  {
    sum += i;
  }

  // display result
  cout << "Sum= " << sum << endl;

  return 0;
}

Output:-

Sum= 55

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