Write a C++ function to sum n natural numbers starting from a given number.

Question

C++, function program

Answer 1

#include<iostream>
using namespace std;

int main()
{
int sum(int);
int n,s=0;
cout<<"How many natural numbers? ";
cin>>n;
s=sum(n);
cout<<"Sum="<<s;
return 0;
}

int sum(int a)
{ int S;
S=(a*(a+1)/2);
return (S);

}

Answer 2

I think you wanted a program like this 😅

https://code.sololearn.com/c5IBcpDD2hbZ/?ref=app

Answer 3

That's a simple for loop where the given number is the sum and n is the end condition. And in the body it has sum += [running variable]

Answer 4

nice job, Euler ^^

Answer 5

But he asked for another starting point. Easy to add this though.
(Sum until end point)-(sum until start point) should do it