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Pseudocode & Flowcharts — Planning Your Code

Learn to plan your programs with pseudocode and flowcharts before writing actual code, making complex problems simpler.

What is Pseudocode?

Pseudocode is a way to plan your program using plain English instead of a specific programming language. It looks like code but is written for humans to read, not computers to run. Why use it? Because it lets you focus on the LOGIC of your program without worrying about syntax, semicolons, or brackets. Once your pseudocode makes sense, translating it to real code is much easier. Think of pseudocode as an outline for an essay. You would not start writing an essay without knowing your main points — and you should not start coding without knowing your main logic.

Pseudocode Example: Guessing Game

text

PROGRAM: Number Guessing Game

SET secret_number to random number between 1 and 100
SET attempts to 0

REPEAT:
    ASK user for their guess
    ADD 1 to attempts
    
    IF guess equals secret_number THEN
        PRINT 'You got it in ' + attempts + ' tries!'
        END GAME
    ELSE IF guess is too high THEN
        PRINT 'Too high! Try lower.'
    ELSE
        PRINT 'Too low! Try higher.'

UNTIL guess equals secret_number

What is a Flowchart?

A flowchart is a visual diagram that shows the flow of decisions and actions in a program. It uses standard shapes: - Oval = Start or End - Rectangle = Action (do something) - Diamond = Decision (yes/no question) - Arrow = Flow direction (what happens next) Flowcharts are especially useful for programs with lots of decisions and branches. They let you see all possible paths through your program at a glance, making it easier to spot missing cases or infinite loops. Many professional developers sketch flowcharts on whiteboards before building complex features.

Pro Tip

When writing pseudocode, use consistent keywords like IF/THEN/ELSE, WHILE/REPEAT, SET, PRINT, and INPUT. Indent nested blocks just like real code. There is no 'wrong' way to write pseudocode as long as another person can read it and understand what the program should do.

Plan Before You Code

Write pseudocode for these programs (do not write real code, just the logic in plain English): 1) A program that asks the user for their age and tells them if they can vote (18 or older), drive (16 or older), or neither. 2) A program that finds the largest number in a list. 3) A simple calculator that takes two numbers and an operation (+, -, *, /) and gives the result. For bonus points, draw a flowchart for one of them using diamonds for decisions and rectangles for actions!

Thinking Like a Programmer — The Developer Mindset

Breaking Problems into Steps — Decomposition

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