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Sum of sum of first n natural numbers in C++
In this problem to find the sum of sum of first n natural numbers, we will find the sum of all numbers from 1 to n and add them together to find the sum.
Let’s take an example to learn about the concept,
Input : 4 Output : 10 Explanation : Sum of first 1 natural number = 1 Sum of first 2 natural number = 1 + 2 = 3 Sum of first 3 natural number = 1 + 2 +3 = 6 Sum of first 4 natural number = 1 + 2 + 3 + 4 = 10 Sum of sum of 4 natural number = 1 + 3 + 6 + 10 = 20
Example
#include <iostream>
using namespace std;
int sumofSum(int n){
int sum = 0;
for (int i=1; i<=n; i++)
sum += i*(i+1)/2;
return sum;
}
int main(){
int n = 4;
cout<<"sum of sum first "<<n<<"natural numbers is "<<sumofSum(n);
return 0;
}Output
sum of sum first 4natural numbers is 20
Updated on: 24-Oct-2019
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