Here is a C++ program to calculate the sum of natural numbers. Natural Numbers are counting numbers, that is 1, 2, 3, 4, 5... etc. Remember, zero and negative numbers are not part of natural numbers. In this program, we will take a positive number N as input from user and find the sum of all natural numbers between 1 to N(including 1 and N).

**Algorithm to calculate sum of natural numbers**

- Take number of elements(let it be N) as input from user using cin.
- Using a for loop, read N number from user and add them to a sum variable.
- Print the sum of all numbers using cout.

## C++ program o find sum of all numbers between 1 to N

#include <iostream> using namespace std; int main(){ int N=0, num, i, sum=0; cout << "Enter the number of integers to add"; cin >> N; cout << "Enter " << N << " numbers seperated by space\n"; for(i= 0; i< N; i++){ cin >> num; sum = sum + num; } cout << "SUM = " << sum; return 0; }Output

Enter the number of integers to add: 6 Enter 5 numbers seperated by space 1 2 3 4 5 6 SUM = 21

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