Progsity

Learn C

Free · 75 parts · 18 modules · 7 lessons

What is inside

Part Zero: before you write a single line

    1. 1What Programming Really IsFree
    2. 2Why Learn C When AI Can Write CodeFree
    3. 3The Story of C: From a Back Room at Bell Labs to Your PhoneFree
    4. 4Compiler, Interpreter, and What Happens When You Press RunFree
    5. 5Where C Runs Today: Six Systems You Already UseFree
    6. 6Structured and Object Oriented: Two Ways to Organise a ProgramFree
    7. 7Module Test: Before You Write a Single LineFree

  2. Module 1 Meet C: Your First Programs, Symbol by Symbol

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Part One: the language, piece by piece

  1. Module 2 Variables and Data Types

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  2. Module 3 Constants, Qualifiers, Input and Output

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  3. Module 4 Operators and Type Conversion

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Part Two: control, functions and recursion

  1. Module 5 Decisions

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  2. Module 6 Loops and Jump Statements

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  3. Module 7 Functions, Scope and Storage Classes

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  4. Module 8 Recursion

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Part Three: memory and data

  1. Module 9 Arrays

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  2. Module 10 Strings

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  3. Module 11 Pointers and Memory

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  4. Module 12 Structures, Unions and Enums

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  5. Module 13 Files

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  6. Module 14 Dynamic Memory

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Part Four: C in the real world

  1. Module 15 The Preprocessor, Headers and Multi File Builds

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  2. Module 16 Undefined Behaviour, Debugging and Reading Real C

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  3. Module 17 Three Projects

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How certificates work

A track certificate is not issued for finishing the lessons. It is issued on a Skill Test: timed, in the browser, with questions drawn at random from a large pool, your code run against hidden tests, and submissions compared for similarity afterwards. The score, 0 to 1000, is printed on the certificate with the band it falls in.

Identity is the account and the name on the certificate. The test is not proctored: no webcam, no ID check, and the certificate and the verify page say so.

The Skill Test is not open yet. This page will say so the day it is.

Score bands

Score is 0 to 1000, across three sections: concepts, read and debug, build.

  • Advanced900 - 1000Certificate issued
  • Proficient750 - 899Certificate issued
  • Working600 - 749Certificate issued
  • Foundation400 - 599Retake
  • Not yet0 - 399Retake

Hiring someone?

Every certificate has a public page carrying the score, the three sections, the date and the test version.

Curriculum and chapter plan by Abu Jafar Md Jakaria, based on the author's own lecture notes and teaching materials. Drafted with AI writing tools, then edited and approved by the author.