CS Fundamentals: Logic & Conditions

1. The Core Concept

At the heart of every computer program is the ability to make decisions. We call these Conditions. Just like you decide to wear a coat IF it is cold outside, computers evaluate data to choose a path.

The If Statement

The simplest check. Runs code only if a condition is true.

                        if (isRaining) {

                          takeUmbrella();

                        }

The If-Else

A fork in the road. Do one thing if true, another if false.

                        if (passwordCorrect) {

                          login();

                        } else {

                          showError();

                        }

Else-If Chain

Checking multiple possibilities in a specific order.

                        if (score > 90) { grade = 'A' }

                        else if (score > 80) { grade = 'B' }

                        else { grade = 'C' }

2. Quick Check

Test your knowledge before moving to the lab.

1. Which statement covers the "backup plan" if all previous conditions are False?

3. Activity: The Smart Thermostat

Mission: You are programming a smart home controller. The system generates a random temperature. You must set the logic rules to ensure the house stays comfortable.

If Temp is above 80°F: Turn on AC (Cooling).
If Temp is below 60°F: Turn on Heat (Heating).
Otherwise: Do nothing (Standby).

Logic Editor

1. IF temperature is > 80:

2. ELSE IF temperature is < 60:

3. ELSE (All other temps):

Simulation Output

❓

System Ready

Waiting for logic...

> System initialized...
> Waiting for code upload...