C++ · Beginner
Simple Function Definition
Functions help organize code into reusable blocks. They can take parameters and return values.
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Beginner C++ exercises
Read these Beginner C++ snippets line by line — each one comes with a written breakdown of what the code does and why.
C++ · Beginner
Conditional Logic with If-Else
Conditional statements allow your program to make decisions based on certain criteria.
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Variables and Data Types
C++ is a strongly typed language, meaning you must declare the type of data a variable will hold.
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The Basic Structure of a C++ Program
Every C++ program starts with a main function. We use #include <iostream> to allow us to print text to the console.
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Working with Arrays
Arrays are used to store multiple values of the same type in a single variable.
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Iterating with For Loops
A for loop repeats a block of code a specific number of times. It is ideal when you know exactly how many iterations are needed.
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The Standard Namespace (std::)
C++ uses namespaces to organize code and avoid naming conflicts. Most standard features are prefixed with 'std::' to indicate they belong to the Standard Library.
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Declaring Constants with const
The 'const' keyword creates a read-only variable. Once initialized, its value cannot be changed, which prevents accidental modifications.
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Using Code Comments
Comments are notes for developers that are completely ignored by the compiler. They are essential for documenting what the code does.
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Iterating with While Loops
A while loop continues to execute as long as its condition is true. It is useful when the number of repetitions depends on a dynamic state.
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Understanding Variables and Data Types
This program demonstrates five fundamental C++ data types. Variables are containers that store values. int stores whole numbers, double stores decimal numbers, char stores single characters, bool s…
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Making Decisions with If-Else Statements
If-else statements allow your program to make decisions based on conditions. The code checks the score variable against multiple thresholds. If the first condition is false, it moves to the next el…
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Creating Reusable Code with Functions
Functions are reusable blocks of code that perform specific tasks. The add function takes two integers, adds them, and returns the result. The printMessage function takes a string and displays it b…
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Working with Arrays
Arrays store multiple values of the same type in contiguous memory. This example creates an integer array with 5 elements. Arrays are indexed starting from 0, so numbers[0] is the first element. Th…
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Understanding Pointers and Memory Addresses
Pointers store memory addresses rather than values. The asterisk (*) declares a pointer type. The ampersand (&) gets the memory address of a variable. Dereferencing (*ptr) accesses the value stored…
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Repeating Actions with Loops
Loops let you repeat code multiple times without writing it again. The for-loop has three parts: start (i = 1), condition (i <= 5), and update (i++). It runs as long as the condition is true.
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Text Manipulation with std::string
The std::string class lets you work with text easily. You can concatenate strings with +, get the length with .length(), and access individual characters by index.
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Enumerations for Named Constants
An enum creates a custom type with named constant values. By default, Monday is 0, Tuesday is 1, and so on. This makes code more readable than using magic numbers.
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Menu Selection with Switch
The switch statement checks a variable against multiple possible values. Each case runs code if it matches. The break prevents falling through to the next case. Default handles any unmatched value.
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User Input with cin
cin (console input) reads user input from the keyboard. The >> operator extracts values and stores them in variables. It automatically handles type conversion for numbers.
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Grouping Data with Structs
Structs allow you to group related variables of different types under a single name. They are the foundation for creating custom data types. Each variable within a struct is called a 'member'. You…
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Boolean Logic with Logical Operators
Logical operators let you combine multiple boolean conditions. && (AND) returns true only if ALL conditions are true. || (OR) returns true if ANY condition is true. ! (NOT) inverts a boolean value.…
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Constants with const and constexpr
Constants are values that cannot change during program execution. Use const for values computed at runtime that won't change. Use constexpr for values that can be computed at compile time - these a…
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References as Aliases
A reference is an alias (alternative name) for an existing variable. Unlike pointers, references cannot be null and must be initialized when created. Use the & symbol in both declaration and functi…
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Introduction to Namespaces
A namespace is a named scope that groups related code elements together, preventing naming conflicts. In larger projects, two different parts might define a function with the same name; namespaces…
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Defining Your First Class
A class is a blueprint for creating objects. It bundles data (variables) and functions (methods) together. The public keyword makes members accessible from outside the class. Objects are instances…
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Constructors and Initialization
A constructor is a special method called automatically when an object is created. It initializes the object's data. Private members can only be accessed by the class itself, protecting internal dat…
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Basic File Input and Output
C++ provides fstream for file operations. ofstream creates and writes to files, while ifstream reads from files. Always check if a file opened successfully using is_open(), and close files when don…
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The Scope Resolution Operator
The :: operator accesses items from specific scopes. Use namespace::item to reach a namespaced variable, or ::variable to access the global scope. This allows precise control over which variable yo…
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Pointers and Memory Addresses
Pointers are variables that store memory addresses instead of actual values. The asterisk (*) declares a pointer type, the ampersand (&) gets the address of a variable, and dereferencing with * acc…
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