Write pseudocode statements for: expressions involving any of the arithmetic or logical operators input from the keyboard and output to the console

11.1 Programming Basics

Learning Objective

Write pseudocode statements that:

• Read arithmetic or logical expressions from the keyboard.
• Evaluate the expressions using the appropriate operators.
• Display the result on the console.

Key Operators

Pseudocode Syntax Conventions

For the purposes of this syllabus the following conventions are used:

1. Input: READ variable – prompts the user and stores the value.
2. Output: WRITE expression – displays the evaluated expression.
3. Assignment: variable ← expression.
4. Comments: # comment text.

Example 1 – Simple Arithmetic Expression

Read two numbers, compute their sum, product and remainder, then display the results.

# Example 1
READ a
READ b
sum ← a + b
product ← a * b
remainder ← a mod b
WRITE "Sum = " + sum
WRITE "Product = " + product
WRITE "Remainder = " + remainder

Example 2 – Logical Expression with Relational Operators

Determine whether a candidate passes an eligibility test based on age and score.

# Example 2
READ age
READ score
eligible ← (age ≥ 18) AND (score ≥ 70)
WRITE "Eligibility: " + eligible

Example 3 – Combined Arithmetic and Logical Operators

Calculate the average of three marks and decide if the student has passed.

# Example 3
READ m1
READ m2
READ m3
average ← (m1 + m2 + m3) / 3
passed ← average ≥ 50
WRITE "Average = " + average
WRITE "Passed? " + passed

Practice Questions

1. Write pseudocode that reads an integer n and outputs whether n is a multiple of 5 or 7.

2. Write pseudocode that reads two numbers x and y, computes (x² + y²) mod 10, and displays the result.

3. Write pseudocode that reads a temperature in Celsius, converts it to Fahrenheit using \$F = \frac{9}{5}C + 32\$, and prints both values.