Learn Programming For Free Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Programming, also known as coding, is the process of creating a set of instructions that tell a computer how to perform a specific task. These instructions, called programs, are written in a language that the computer can understand and execute. Welcome to our journey into the world of programming! This article will guide you through the essentials of learning how to code, from understanding what is programming, to exploring its various aspects including handling numbers, text, patterns, geometry, date and time, and creating menu-driven programs. Whether you’re a beginner or an experienced coder, there’s something for everyone. Let’s dive in! Learn Programming BasicsWhat is Programming? A Handbook for BeginnersWhat is a Code in Programming?Programming Tutorial | Introduction, Basic Concepts, Getting started, ProblemsLearn Different Components of ProgrammingSyntax in ProgrammingData Types in ProgrammingType Casting in ProgrammingVariables in ProgrammingOperators in ProgrammingTypes of Operators in ProgrammingConditional Statements in ProgrammingIf-Then-___ Trio in ProgrammingLoops in ProgrammingFor loop in ProgrammingWhile loop in ProgrammingDo-While loop in ProgrammingDifference between for loop and while loop in ProgrammingDifference between while loop and do-while loop in ProgrammingFunctions in ProgrammingError Handling in ProgrammingSetting up first IDE/Environment IntegrationMost Famous Online IDE for ProgrammingGetting Started with CodingWhat Is Coding and What Is It Used For?How to Learn Programming?How to Start Coding?How to learn Pattern printing easily?What are the 4 types of Programming?Learn How to Code Numbers in ProgrammingDigits:Write a program to reverse digits of a numberCheck whether a given number is even or oddProgram to count digits in an integer (4 Different Methods)Write a program to print 1 to 100 without using any numerical valueNumber System:Program to find the sum and difference of two numbers Program to find the average of two numbers Program for Fahrenheit to Celsius conversion Program to check a number is divisible by 5 or notNumber ArithmeticProgram for Sum of the digits of a given number Program to Print Multiplication Table of a NumberProgram for factorial of a numberProgram for Decimal to Binary Conversion Prime Numbers Series and SequencesProgram to print first 10 even numbers Program to print first 10 prime numbers Program to print all three digit numbers in ascending orderProgram for n-th odd number Find n-th term of series 1, 3, 6, 10, 15, 21... Program to print first 10 perfect squares Program to print first 10 numbers of Fibonacci series Program to print all two-digit numbers in descending orderProgram to print all multiples of 7 till 1000Program to print numbers having remainder 3 when divided by 11Random NumbersProgram to generate a random single digit numberProgram to generate a random two-digit numberProgram to generate a random three digit even numberGenerate a Random Number between 0 and 1Program to generate a random number between L to RSpecial NumbersCheck if a number is PalindromeProgram for Armstrong Numbers Check if given number is perfect square Perfect Number Spy Number (Sum and Products of Digits are same) Ugly Numbers Neon Number Automorphic NumberLearn How to Code Words and Sentences in ProgrammingWordsProgram to count the number of characters in a wordProgram to count the number of vowels in a wordProgram to count the number of consonants in a wordProgram to reverse a wordSentencesProgram to count the number of words in a sentenceProgram to reverse order of words in a sentenceProgram to find the length of the longest word in a sentenceLearn How to Code Patterns or Printing Patterns in ProgrammingPyramid PatternsProgram to print Right Half Pyramid Pattern (Star Pattern) Program to print Left Half Pyramid Pattern (Star Pattern) Program to print Full Pyramid Pattern (Star Pattern) Program to print Inverted Right Half Pyramid Pattern (Star Pattern) Program to print Inverted Left Half Pyramid Pattern (Star Pattern)Program to print Inverted Full Pyramid Pattern (Star Pattern)Triangle PatternsProgram to Print Floyd's TriangleProgram to print binary right angle triangleDiamond PatternProgram to print the diamond shape Hour-glass PatternSquare PatternsProgram to print hollow rectangle or square star patternsOther PatternsProgram to print Butterfly Pattern (Star Pattern)Program to print solid and hollow rhombus patternsLearn How to Code for Geometry in ProgrammingPoints and LineProgram to check if three points are collinearProgram to calculate distance between two pointsProgram to find the mid-point of a lineCircleProgram to find diameter with the given radius of a circleProgram to find area of a CircleProgram to find Circumference of a CircleProgram to find diameter with the given radius of a circleTriangleCheck whether triangle is valid or not if sides are given Check if a right-angled triangle can be formed by the given coordinates Find Perimeter of a triangleProgram to find area of a triangleRectangleProgram for Area And Perimeter Of RectangleProgram to calculate the length of the diagonal in a rectangleProgram to check if a rectangle is a square or notProgram to calculate the length of the diagonal in a rectangleSquareProgram to find Perimeter / Circumference of Square and Rectangle Program to find the area of a SquareProgram to calculate length of diagonal of a squareProgram to find the side length of a square given its areaProgram to find the perimeter of a square given its areaPolygonsProgram to find the Perimeter of a Regular Polygon Program to find the Interior and Exterior Angle of a Regular PolygonCheck if it is possible to create a polygon with a given angleLearn How to Code for Date and Time in ProgrammingDate ConversionsProgram to convert time from 12 hour to 24 hour formatConvert time from 24 hour clock to 12 hour clock format Time ConversionsProgram to convert minutes to secondsProgram for converting hours into minutes and secondsProgram for converting hours into minutes and secondsYear ProgramsProgram to check if a given year is leap yearProgram to print the number of days in a given yearWeek ProgramsProgram to convert weeks to daysProgram to convert given weeks to hours Year ProgramsProgram to count the number of months between given two yearsProgram to count the number of days between two yearsDay ProgramsFind number of days between two given datesProgram to convert days to weeksLearn How to Code Menu Driven Programs in ProgrammingProgram to check if a person can vote using his age | Menu-DrivenProgram to check if a student passes/fails using his grade | Menu DrivenProgram to Assign grades to a student using Nested If ElseProgram to print the name of month using the month number | Menu-DrivenProgram to calculate Electricity BillMenu Driven C++ Program for a Simple Calculator Menu-Driven Program for Bank Management SystemLearn How to Code Popular Character Encoding Systems in ProgrammingWhat is ASCII - A Complete Guide to Generating ASCII CodeMorse Code TutorialProgram for Morse Code Translator (Conversion of Morse Code to English Text)Programming Challenges:Coding Challenge for Beginners | Coding Practice ChallengesBasic Programming Problems Comment More infoAdvertise with us Next Article Types of Asymptotic Notations in Complexity Analysis of Algorithms H harendrakumar123 Follow Improve Article Tags : DSA Similar Reads Basics & PrerequisitesTime Complexity and Space ComplexityMany times there are more than one ways to solve a problem with different algorithms and we need a way to compare multiple ways. Also, there are situations where we would like to know how much time and resources an algorithm might take when implemented. To measure performance of algorithms, we typic 13 min read Types of Asymptotic Notations in Complexity Analysis of AlgorithmsWe have discussed Asymptotic Analysis, and Worst, Average, and Best Cases of Algorithms. The main idea of asymptotic analysis is to have a measure of the efficiency of algorithms that don't depend on machine-specific constants and don't require algorithms to be implemented and time taken by programs 8 min read Data StructuresGetting Started with Array Data StructureArray is a collection of items of the same variable type that are stored at contiguous memory locations. It is one of the most popular and simple data structures used in programming. Basic terminologies of ArrayArray Index: In an array, elements are identified by their indexes. Array index starts fr 14 min read String in Data StructureA string is a sequence of characters. The following facts make string an interesting data structure.Small set of elements. Unlike normal array, strings typically have smaller set of items. For example, lowercase English alphabet has only 26 characters. ASCII has only 256 characters.Strings are immut 2 min read Hashing in Data StructureHashing is a technique used in data structures that efficiently stores and retrieves data in a way that allows for quick access. Hashing involves mapping data to a specific index in a hash table (an array of items) using a hash function. It enables fast retrieval of information based on its key. The 2 min read Linked List Data StructureA linked list is a fundamental data structure in computer science. It mainly allows efficient insertion and deletion operations compared to arrays. Like arrays, it is also used to implement other data structures like stack, queue and deque. Here’s the comparison of Linked List vs Arrays Linked List: 2 min read Stack Data StructureA Stack is a linear data structure that follows a particular order in which the operations are performed. The order may be LIFO(Last In First Out) or FILO(First In Last Out). LIFO implies that the element that is inserted last, comes out first and FILO implies that the element that is inserted first 2 min read Queue Data StructureA Queue Data Structure is a fundamental concept in computer science used for storing and managing data in a specific order. It follows the principle of "First in, First out" (FIFO), where the first element added to the queue is the first one to be removed. It is used as a buffer in computer systems 2 min read Tree Data StructureTree Data Structure is a non-linear data structure in which a collection of elements known as nodes are connected to each other via edges such that there exists exactly one path between any two nodes. Types of TreeBinary Tree : Every node has at most two childrenTernary Tree : Every node has at most 4 min read Graph Data StructureGraph Data Structure is a collection of nodes connected by edges. It's used to represent relationships between different entities. If you are looking for topic-wise list of problems on different topics like DFS, BFS, Topological Sort, Shortest Path, etc., please refer to Graph Algorithms. Basics of 3 min read Trie Data StructureThe Trie data structure is a tree-like structure used for storing a dynamic set of strings. It allows for efficient retrieval and storage of keys, making it highly effective in handling large datasets. Trie supports operations such as insertion, search, deletion of keys, and prefix searches. In this 15+ min read AlgorithmsSearching AlgorithmsSearching algorithms are essential tools in computer science used to locate specific items within a collection of data. In this tutorial, we are mainly going to focus upon searching in an array. When we search an item in an array, there are two most common algorithms used based on the type of input 2 min read Sorting AlgorithmsA Sorting Algorithm is used to rearrange a given array or list of elements in an order. For example, a given array [10, 20, 5, 2] becomes [2, 5, 10, 20] after sorting in increasing order and becomes [20, 10, 5, 2] after sorting in decreasing order. There exist different sorting algorithms for differ 3 min read Introduction to RecursionThe process in which a function calls itself directly or indirectly is called recursion and the corresponding function is called a recursive function. A recursive algorithm takes one step toward solution and then recursively call itself to further move. The algorithm stops once we reach the solution 14 min read Greedy AlgorithmsGreedy algorithms are a class of algorithms that make locally optimal choices at each step with the hope of finding a global optimum solution. At every step of the algorithm, we make a choice that looks the best at the moment. To make the choice, we sometimes sort the array so that we can always get 3 min read Graph AlgorithmsGraph is a non-linear data structure like tree data structure. The limitation of tree is, it can only represent hierarchical data. For situations where nodes or vertices are randomly connected with each other other, we use Graph. Example situations where we use graph data structure are, a social net 3 min read Dynamic Programming or DPDynamic Programming is an algorithmic technique with the following properties.It is mainly an optimization over plain recursion. Wherever we see a recursive solution that has repeated calls for the same inputs, we can optimize it using Dynamic Programming. The idea is to simply store the results of 3 min read Bitwise AlgorithmsBitwise algorithms in Data Structures and Algorithms (DSA) involve manipulating individual bits of binary representations of numbers to perform operations efficiently. These algorithms utilize bitwise operators like AND, OR, XOR, NOT, Left Shift, and Right Shift.BasicsIntroduction to Bitwise Algorit 4 min read AdvancedSegment TreeSegment Tree is a data structure that allows efficient querying and updating of intervals or segments of an array. It is particularly useful for problems involving range queries, such as finding the sum, minimum, maximum, or any other operation over a specific range of elements in an array. The tree 3 min read Pattern SearchingPattern searching algorithms are essential tools in computer science and data processing. These algorithms are designed to efficiently find a particular pattern within a larger set of data. Patten SearchingImportant Pattern Searching Algorithms:Naive String Matching : A Simple Algorithm that works i 2 min read GeometryGeometry is a branch of mathematics that studies the properties, measurements, and relationships of points, lines, angles, surfaces, and solids. From basic lines and angles to complex structures, it helps us understand the world around us.Geometry for Students and BeginnersThis section covers key br 2 min read Interview PreparationInterview Corner: All Resources To Crack Any Tech InterviewThis article serves as your one-stop guide to interview preparation, designed to help you succeed across different experience levels and company expectations. Here is what you should expect in a Tech Interview, please remember the following points:Tech Interview Preparation does not have any fixed s 3 min read GfG160 - 160 Days of Problem SolvingAre you preparing for technical interviews and would like to be well-structured to improve your problem-solving skills? Well, we have good news for you! GeeksforGeeks proudly presents GfG160, a 160-day coding challenge starting on 15th November 2024. In this event, we will provide daily coding probl 3 min read Practice ProblemGeeksforGeeks Practice - Leading Online Coding PlatformGeeksforGeeks Practice is an online coding platform designed to help developers and students practice coding online and sharpen their programming skills with the following features. GfG 160: This consists of most popular interview problems organized topic wise and difficulty with with well written e 6 min read Problem of The Day - Develop the Habit of CodingDo you find it difficult to develop a habit of Coding? If yes, then we have a most effective solution for you - all you geeks need to do is solve one programming problem each day without any break, and BOOM, the results will surprise you! Let us tell you how:Suppose you commit to improve yourself an 5 min read Like