C · Beginner
Variable Data Types
In C, you must declare the type of data a variable will hold, such as integers (int), floating-point numbers (float), or single characters (char).
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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
If-Else Control Flow
Conditional statements allow the program to make decisions and execute different blocks of code based on a boolean expression.
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Hello World Basics
This is the simplest C program. It includes the standard input-output library and defines the main entry point where execution begins.
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Simple For Loop
A for loop repeats a block of code a specific number of times, using a counter variable to track progress.
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Function Definition
Functions are reusable blocks of code that perform specific tasks. They can take parameters and return a value.
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Strings as Character Arrays
In C, strings are simply arrays of characters ending with a special null character '\0'.
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Defining a Struct
A struct is a user-defined data type that allows grouping related variables of different types together.
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The Switch Statement
The switch statement is an alternative to long if-else chains. It compares a variable against multiple 'case' values and executes the matching block.
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The While Loop
The while loop repeats a block of code as long as a specified condition remains true. It is useful when the number of iterations is not known in advance.
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Basic Array Initialization
An array stores a fixed-size sequential collection of elements of the same type. Indexing starts at 0.
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Arithmetic Operators and Modulo
Arithmetic operators perform mathematical calculations. The modulo operator (%) is particularly useful as it returns the remainder of a division.
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Logical Operators
Logical operators allow you to combine multiple conditions. && represents AND (both must be true), while || represents OR (at least one must be true).
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Constants with #define
The #define directive creates a macro, which the preprocessor replaces with the specified value before compilation. It is commonly used for fixed values that shouldn't change.
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The Address-of Operator (&)
In C, every variable is stored in a specific memory location. The ampersand (&) operator retrieves the memory address of a variable.
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The Ternary Operator
The ternary operator is a shorthand for a simple if-else statement. It evaluates a condition and returns one of two values.
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The do-while Loop
A do-while loop ensures that the code block is executed at least once, as the condition is checked after the execution.
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Measuring Memory with sizeof
The sizeof operator returns the size of a variable or data type in bytes, which is essential for memory management.
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Type Aliasing with typedef
The typedef keyword creates a new name for an existing data type, making the code more descriptive and readable.
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Accessing 2D Array Elements
Two-dimensional arrays use two indices: the first for the row and the second for the column.
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Explicit Type Casting
Type casting allows you to manually convert a value from one data type to another, such as truncating a float to an int.
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The while Loop
A while loop repeatedly executes its body as long as the given condition remains true (non-zero in C).
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The switch Statement
The switch statement allows you to select one of many code blocks to be executed based on the value of a variable.
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Array Initialization
You can declare and initialize an array in one step using curly braces to list the starting values.
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String Null Terminator
In C, strings are null-terminated, meaning they always end with a hidden '\0' character to mark the end of the text.
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Escape Sequences
Escape sequences start with a backslash and allow you to represent non-printable characters like newlines or tabs.
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The if-else Statement
The if-else statement allows the program to choose between two code blocks based on a condition. If the condition in the parentheses is true, the first block runs; otherwise, the second block in th…
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The for Loop
A for loop is used to repeat code a specific number of times. It bundles initialization, a condition check, and an update step (like incrementing a counter) into a single line.
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Function Parameters
Parameters act as placeholders for values passed into a function. This allows the same function to work with different data every time it is called.
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Single and Multi-line Comments
Comments are notes for developers that are completely ignored by the compiler. Use // for short notes and /* */ for notes spanning multiple lines.
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Basic Struct Definition
A struct (structure) is a custom data type that lets you group different variables together under one name. It is useful for representing complex objects like a user or a point.
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