Recap - Sigma Function

Part of the Fundamentals section of Coddy's C++ journey — lesson 55 of 74.

Challenge

Easy

Write a function named sigma with one argument that represents a number n.

The function will return the sum of all the numbers from 1 to n (including).

For example, for sigma(5), the function will return 15, because 15 = 1 + 2 + 3 + 4 + 5.

Try it yourself

#include <iostream>

int sigma(int n) {
    // Write your code below
}

int main() {
    int n;
    std::cin >> n;
    int res = sigma(n);
    std::cout << res;
    return 0;
}

All lessons in Fundamentals

1Introduction

C++Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Modulo Operator Increment/Decrement Post Increment/Decrement Arithmetic Shortcuts Comparison Operators String Comparison

7Input/Output Basics

cout Statement cin Statement String Input Recap - Till 120 Recap - True or False

10Functions

Declare a Function Parameters Return Types Function OverloadingRecap - Sigma FunctionRecap - Validation Function Void Functions

13Final Challenges

Number Pattern Pattern Finder Student Grade Calculator