Writing Complete Programs in Cambridge Pseudocode

In the IGCSE exam, Paper 2 requires you to write complete pseudocode programs — not just snippets. This lesson consolidates all the elements you have learned: variables, selection, iteration, arrays, procedures/functions, and file handling — combined into complete solutions.

Cambridge Pseudocode Quick Reference

Complete Program Example 1: Grade Calculator

// Reads 5 exam scores and outputs grades
DECLARE scores : ARRAY[1:5] OF INTEGER
DECLARE i : INTEGER
DECLARE total : INTEGER
total ← 0
FOR i ← 1 TO 5
    INPUT scores[i]
    total ← total + scores[i]
NEXT i
average ← total / 5
IF average >= 70 THEN
    OUTPUT "Grade A"
ELSE IF average >= 60 THEN
    OUTPUT "Grade B"
ELSE IF average >= 50 THEN
    OUTPUT "Grade C"
ELSE
    OUTPUT "Fail"
ENDIF
OUTPUT "Average: " & average

Complete Program Example 2: Number guessing validation

// Validates a number between 1 and 100
DECLARE guess : INTEGER
REPEAT
    OUTPUT "Enter a number between 1 and 100:"
    INPUT guess
UNTIL guess >= 1 AND guess <= 100
OUTPUT "Valid guess: " & guess

Complete Program Example 3: File reading with count

// Counts records in a file
DECLARE line : STRING
DECLARE count : INTEGER
count ← 0
OPENFILE "data.txt" FOR READ
WHILE NOT EOF("data.txt") DO
    READFILE "data.txt", line
    count ← count + 1
ENDWHILE
CLOSEFILE "data.txt"
OUTPUT "Total records: " & count

Trace Table for Example 2