Question

Write a recursive function named arithmeticSum that takes a positive integer parameter n and returns the sum of the integer numbers from 1 to n Please write in C++

Answer 1

#include <bits/stdc++.h>
using namespace std;

int arithmeticSum(int n) { // recursive function
if(n<0){
return -1; //negative no not allowed
}
if(n == 0) { //base case
return n;
}
return n + arithmeticSum(n-1); //recursive call
}

int main()
{
int n, sum=0;
cout<<"Enter n: "<<endl;
cin>>n;
sum = arithmeticSum(n);
if(sum == -1) {
cout<<"Negative numbers not allowed"<<endl;
} else {
cout<<"Sum of numbers from 1 to "<<n<<": "<<sum;
}
}