Coding Exercise on Recursion with Solution | C++ Placement Course | lecture 75

In this lecture we will write a C++ program to find out sum of digits of a given number using Recursion and then we will dry run that program to understand the working properly.

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[anjaliraja-xpdf]

#include<iostream>
using namespace std;
unsigned long long natural_no(int n);
int main()
{
while(true)
{

int n;
cout<<"Enter a number(0 to stop): ";
cin>>n;
cout<<"sum of 1 to
if(n==0)
{
break;
}
}
return 0;

}
unsigned long long natural_no(int n)
{
if(n==0)
{
return 0;
}
else
{
return n+natural_no(n-1);
}
}

[juanmacias]

the main function returns 0 implicitly, you don't actually have to write it out. :D
Edit: my code:

#include <iostream>
int re_sum_to(int n, int target) {
if (n == target)
return n;
return n + re_sum_to(n + 1, target);
}
int main() { std::cout << re_sum_to(1, 3) << '\n'; }

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9. Using Classes in C++

Principles of Object-Oriented Programming, Defining & Using Classes, Class Constructors,
Constructor Overloading, Function overloading in classes, Class Variables &Functions, Objects
as parameters, Specifying the Protected and Private Access, Copy Constructors, Overview of
Template classes and their use.


10. Overview of Function Overloading and Operator Overloading

Need of Overloading functions and operators, Overloading functions by number and type of
arguments, Looking at an operator as a function call, Overloading Operators (including
assignment operators, unary operators)


11. Inheritance, Polymorphism and Exception Handling

Introduction to Inheritance (Multi-Level Inheritance, Multiple Inheritance), Polymorphism (Virtual
Functions, Pure Virtual Functions), Basics Exceptional Handling (using catch and throw, multiple catch
statements), Catching all exceptions, Restricting exceptions, Rethrowing exceptions.