#include <iostream> #include <conio.h> using namespace std; int addNumbers(int); //function Prototype int main() { int num; //variable declaration cout<<"enter a positive integer find sum: "; cin>>num; cout<<"Sum of natural numbers are until "<<num<<":"<<addNumbers(num); //functiuon call getch(); return 0; } int addNumbers(int n)//function definition { if(n!= 0) return n+addNumbers(n-1); else return n; }
OUTPUT:–
Enter a positive integer to find sum: 25 Sum of natural numbers are until 25: 325