Learn PSeInt step by step.

Variables

A variable gives a name to a value your algorithm needs to remember. Use clear names that describe the meaning of the data.

Algorithm AgeExample
  Define age As Integer
  age <- 20
  Write age
EndAlgorithm

Input and output

Input lets the user provide data. Output shows information back to the user. Practice this before adding decisions.

Algorithm Greeting
  Define name As String
  Write "What is your name?"
  Read name
  Write "Hello " , name
EndAlgorithm

Conditions

Conditions let an algorithm choose between different paths. Ask a clear true-or-false question and decide what should happen in each case.

Algorithm AdultCheck
  Define age As Integer
  Read age
  If age >= 18 Then
    Write "Adult"
  Else
    Write "Minor"
  EndIf
EndAlgorithm

Loops

Loops repeat a block of instructions. Start with a For loop when you already know how many repetitions are needed.

Algorithm CountToFive
  Define i As Integer
  For i <- 1 To 5 Do
    Write i
  EndFor
EndAlgorithm

Functions and reusable logic

Once algorithms become longer, break repeated or meaningful tasks into smaller reusable units. This improves readability and prepares you for structured programming.

A simple practice plan

Write two or three tiny algorithms for each topic before progressing. Then combine the topics in a small project such as a grade calculator, number guessing flow or simple menu.

Useful rule: do not copy the final solution immediately. First write the steps in plain English, turn them into pseudocode, run the logic, then compare your result with an example.