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Live: will automatically execute upon every character typed (warning: could result in issues if you have intensive or partially-completed code that results in an infinite loop)

Exited code editor: will automatically execute code when the code editor loses focus - i.e. when you click outside of the code editor

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Pseudocode

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Java

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Note: code may be re-ordered (e.g. all declarations moved to the top) due to the way the site works

Tested and works for all demo programs - please contact me if this breaks any of your working code!

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Note: pressing FN/F11/ESC keys isn't recommended, since they can't be detected by the site, hence the additional 'quite mode' settings can't be applied - the removing of the nav bar & footer. To enter this fullscreen mode, either use this button or the keyboard shortcut CTRL + M (minimise <-> maximise)

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Error Checks

The site aims to enforce the statically-typed nature of pseudocode - i.e. assigning a STRING to an INTEGER variable should be forbidden. Some combinations are allowed, however - such as assigning a CHAR to a STRING or an INTEGER to a REAL. Other additional checks to ensure valid pseudocode are also in place

The site has been well-tested and there aren't any bugs we are aware of, however, if you believe the site is incorrectly giving you an error & preventing your code from running, you can disable the error-checking

In such cases, please feel free to contact us

Note that it is not possible to disable fatal error messages such as syntax errors, runtime errors etc

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If enabled, the following information will be shown:

  • Keyword/Identifier/Module Name Suggestions
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  • Examples

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Will cause "<-" to be replaced with the Unicode "←" symbol as the user is typing - can also use CTRL + SHIFT + < to insert this symbol

Allow LENGTH() for Arrays

Turning this on will disable the warning message if using the LENGTH function to get the number of elements in an array

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If enabled, you will get warnings if trying to access uninitialised variables

Code Snippets

These are pre-written code templates - for example, if you type in "DECLARE" in the code editor, you will see options to declare single variables, 1 & 2D arrays - you can disable this option

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Max Execution Time

To prevent infinite loops resulting in the page becoming unresponsive, code will automatically terminate if this value (in seconds) is exceeded

If you have a legitimate long-running program, you can obviously set this to a high value - alternatively, setting to -1 will disable this check

IGCSE Syllabus (Pseudocode p33) O-Level Syllabus (Pseudocode p33) A-Level Pseudocode Guide A-Level Pseudocode Functions Report Bugs
YouTube Tutorials Discord Help
AssemblyCode BooleanLogic
Demos🧑🏻‍🏫 Keyword List📜 Monthly Challenge: Getting...📆
{"0":"Algorithms","1":"Selection","2":"Iteration","3":"Arrays","4":"Records","5":"ENUMs","6":"Custom Modules","7":"Files","8":"Object-Oriented Programming","9":"Abstract Data Types","10":"Sets","11":"Pointers","12":"Recursion","13":"Exam Questions","14":"Games","15":"Mathematics","16":"Art","17":"Utilities","18":"Other"}

Welcome to Pseudocode Pro

This site was developed to solve the problems of students either being completely stuck with pseudocode, or attempting a solution, but having no way of actually validating if it would work (other than a manual trace table). This site supports the entire Cambridge IGCSE (0478), O-Level (2210) and 9618 A-Level pseudocode specifications from the guide/syllabus, with extension modules supporting sound, canvas, events, custom html etc

Below are lists of both the currently support pseudocode and general website features:

  • 📦 Variables & Constants
  • ➕ Arithmetic & Logical Operators
  • 📥📤 INPUT & OUTPUT
  • ❓❌ IF/ELSE & CASE
  • 🔁 FOR/WHILE/REPEAT...UNTIL Loops
  • 🔧 FUNCTIONS & PROCEDURES
  • 🔢 BYVAL & BYREF
  • 🔢 ARRAYs
  • 📒 TYPEs (Records & Enums)
  • 📄 File Handling (Text & RANDOM)
  • 🧩 Object-Oriented Programming
  • 🪣 Sets
  • 👉 Pointers
  • --- Extra Non-Syllabus Features ---
  • 🔊 Sound
  • 🎨 Canvas
  • 🖲️ Events
  • 🖥️ Custom HTML

Additional programs uploaded by the community can be found on the search page.

While you are here, why not try one of the many - and ever increasing list of - pseudocode coding challenges.

To support hosting & domain costs, for $2, a premium account can be purchased - this has the following benefits:

Those last 2 features are currently in progress, so an extra 3 months free will be given to anyone who buys a license now to acknowledge this

For any issues, feature requests, comments etc, you can contact me

Token List

Work in progress: some buttons currently don't work...just select "All"

Token Description Example Parameters

Thanks for using the site - I hope you enjoy it and if you do, it would mean a lot if you could share it with your friends too :)

Drag & drop code or data files here

{"c":"\/\/ * Code Author: CallistaFan\n\/\/ * Date: 2025\/04\/14\n\/\/ * Description: \n\/\/ * Categories: \n\nDECLARE service,age: INTEGER\r\nDECLARE price: REAL\r\nDECLARE spec,choice: STRING\r\n\r\nPROCEDURE CS\r\nOUTPUT \"Welcome to C&S Car Sales System. How can we help you today?\"\r\nOUTPUT \"Type '1':Sales, '2':Price prediction\"\r\nINPUT service\r\n\r\nIF service = 1\r\n THEN\r\n DECLARE cost: REAL\r\nDECLARE method, months, member: STRING\r\nDECLARE mode: INTEGER\r\n\r\nOUTPUT \"Enter cost of the new car (to the nearest Rp):\"\r\nINPUT cost\r\nOUTPUT \"How would you like to pay? (cash\/installment)\"\r\nINPUT method\r\nIF method = \"cash\" OR \"Cash\" THEN\r\n cost \u2190 ROUND(cost, 0)\r\n OUTPUT \"Do you have a membership? (yes\/no)\"\r\n INPUT member\r\n IF member = \"yes\" OR \"Yes\" THEN\r\n cost \u2190 cost - (5 * cost \/ 100)\r\n ENDIF\r\n OUTPUT \"The cost when paid in cash is Rp \", cost\r\n OUTPUT \"Since you paid in cash, you get a voucher for 10% off your next purchase! Redeem at any of our outlets. Expiry date: December 31 2025\"\r\nENDIF\r\nREPEAT\r\nIF method = \"installment\" OR \"Installment\" THEN\r\n OUTPUT \"Choose between these installment modes: 12, 24, 36, 60:\"\r\n INPUT mode\r\n IF mode = 12 THEN\r\n cost \u2190 cost * (1 + 0.02 * 1)\r\n OUTPUT \"Interest rate: 2%\"\r\n OUTPUT \"Amount paid per month:\" , cost \/ 12\r\n OUTPUT \"The total cost when paid in installments of 12 months is Rp \", cost\r\n OUTPUT \"You get a voucher for a free car wash! Redeem at any of our outlets. Expiry date: December 31 2025\"\r\n ELSE IF mode = 24 THEN\r\n cost \u2190 cost * (1 + 0.04 * 2)\r\n OUTPUT \"Interest rate: 4%\"\r\n OUTPUT \"Amount paid per month:\" , cost \/ 24\r\n OUTPUT \"The total cost when paid in installments of 24 months is Rp \", cost\r\n OUTPUT \"You get 2 vouchers for free car washes! Redeem at any of our outlets. Expiry date: December 31 2025\"\r\n ELSE IF mode = 36 THEN\r\n cost \u2190 cost * (1 + 0.06 * 3)\r\n OUTPUT \"Interest rate: 6%\"\r\n OUTPUT \"Amount paid per month:\" , cost \/ 36\r\n OUTPUT \"The total cost when paid in installments of 36 months is Rp \", cost\r\n OUTPUT \"You get a voucher for a free car wash and a tyre change! Redeem at any of our outlets. Expiry date: December 31 2025\"\r\n ELSE IF mode = 60 THEN\r\n cost \u2190 cost * (1 + 0.08 * 5)\r\n OUTPUT \"Interest rate: 8%\"\r\n OUTPUT \"Amount paid per month:\" , cost \/ 60\r\n OUTPUT \"The total cost when paid in installments of 60 months is Rp \", cost\r\n OUTPUT \"You get a voucher for 5% off your next purchase, a free car wash, and a tyre change! Redeem at any of our outlets. Expiry date: December 31 2025\"\r\n ELSE \r\n OUTPUT \"Invalid mode. Enter again\"\r\n ENDIF\r\n ENDIF\r\n ENDIF\r\n ENDIF\r\n ENDIF\r\nUNTIL mode = 12 OR 24 OR 36 OR 60\r\nENDIF\r\n\r\nIF service = 2\r\n THEN\r\n OUTPUT \"Please enter car specification ex. Toyota Alphard 2024\"\r\n INPUT spec\r\n OUTPUT \"Enter price of car to nearest Rupiah\"\r\n INPUT price\r\n age \u2190 0\r\n WHILE age <> 9 AND price >= 16819000 DO\r\n price \u2190 ROUND(price,0)\r\n OUTPUT \"At age \",age,\" years old, \", spec,\" costs \", price\r\n age \u2190 age + 1\r\n IF age = 1\r\n THEN price \u2190 price * 0.6\r\n ENDIF\r\n IF age > 1\r\n THEN price \u2190 price * 0.8\r\n ENDIF\r\n ENDWHILE\r\n IF age = 9\r\n THEN OUTPUT \"This is maximum age for prediction\"\r\n ENDIF\r\n IF price < 16819000\r\n THEN OUTPUT \"Price the following year is below $1000 or Rp16819000, process terminated\"\r\n ENDIF\r\nENDIF \r\n\r\nIF service > 2\r\n THEN\r\n OUTPUT \"Wrong number entered. Please retry!\"\r\nENDIF\r\nENDPROCEDURE\r\n\r\nREPEAT \r\nOUTPUT \"\" \r\nOUTPUT \"Would you like to use the C&S Car Sales System? yes or no\"\r\nINPUT choice\r\nIF choice = \"yes\" THEN\r\n CALL CS\r\nELSE IF choice = \"no\"\r\n THEN OUTPUT \"Service session ended!\"\r\nENDIF\r\nENDIF\r\nUNTIL choice <> \"yes\"","t":"Car Sales System"}
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