Here is a recursive function that takes a number inputted by the user and find the sum of all numbers from 1 to that number:
#include <iostream>
using namespace std;
int recursion(int num);
int main(){
int num = 0;
int sumNum;
cout << “Enter any integer greater than 0: ” << endl;
cin >> num;
sumNum = recursion(num);
cout << “The sum is: ” << sumNum << endl;
cin.ignore();
cin.get();
return 0;
}
int recursion(int num)
{
int sum = 0;
if(num == 1){
return 1;
}
else{
sum = recursion(num-1) + num;
return sum;
}
}
Happy coding!
