Question

How to calculate the sum of first N natural numbers in C++

Answer 1

#include <iostream>

// 1 + 2 + 3 + 4 + ... + N

int main()
{
	int n = 10, sum = 0;

	while (n > 0)
	{
		sum += n;
		n--;
	}

	std::cout << "The sum is: " << sum << std::endl;

	return 0;
}


/*
run:

The sum is: 55

*/

 

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Answer 2

#include <iostream>

// 1 + 2 + 3 + 4 + ... + N

int main()
{
	int n = 10, sum = 0;

	sum = n / 2 * (n + 1);

	std::cout << "The sum is: " << sum << std::endl;

	return 0;
}


/*
run:

The sum is: 55

*/

 

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