Arithmetic Shortcuts

Part of the Fundamentals section of Coddy's C++ journey — lesson 20 of 74.

C++ created a cool shortcut for self-arithmetic operations.

For example instead of writing:

int a = 5;
a = a + 3; // a holds 8

We can simplify it by writing +=:

int a = 5;
a += 3; // a holds 8

The += is adding to a itself the value 3

This operation is valid for all arithmetic operations:

Operator	Shortcut
+	+=
-	-=
*	*=
/	/=
%	%=

Challenge

Beginner

You are given a code with initialization of count. (Don't delete this line!)

Your task is to add the following operations, in this order:

Add 4 to count
Multiply count by 2
Subtract 1 from count

Use the arithmetic shortcuts to do so!

Cheat sheet

C++ provides shortcut operators for self-arithmetic operations:

Operator	Shortcut
+	+=
-	-=
*	*=
/	/=
%	%=

Instead of writing:

int a = 5;
a = a + 3; // a holds 8

You can use the shortcut:

int a = 5;
a += 3; // a holds 8

Try it yourself

#include <iostream>

int main() {
    int count = 0;
    
    // Type your code below
    
    
    // Don\'t change the line below
    std::cout << "count = " << count;
    return 0;
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

C++Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Modulo Operator Increment/Decrement Post Increment/DecrementArithmetic ShortcutsComparison 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 Overloading Recap - Sigma Function Recap - Validation Function Void Functions

13Final Challenges

Number Pattern Pattern Finder Student Grade Calculator