Sequence Examples in CS Thinking
Start with the recap, study the fully worked examples, then use the practice problems to check your understanding of Sequence.
This page combines explanation, solved examples, and follow-up practice so you can move from recognition to confident problem-solving in CS Thinking.
Concept Recap
Executing a series of instructions one after another in a fixed, specific order. In sequential execution, each instruction must complete before the next one begins, and the order in which statements appear determines the order in which they run.
Do this, then that, then the next thing—order matters and each step must finish before the next.
Read the full concept explanation →How to Use These Examples
- Read the first worked example with the solution open so the structure is clear.
- Try the practice problems before revealing each solution.
- Use the related concepts and background knowledge badges if you feel stuck.
What to Focus On
Core idea: Each step must complete fully before the next step begins; the order determines the result.
Common stuck point: Some steps can't be reordered; others can. Understanding dependencies is key.
Sense of Study hint: When writing sequential code, think about which steps depend on results from earlier steps. If step B uses a value computed in step A, then A must come first. Trace through your sequence line by line to verify the order produces the correct result.
Common Mistakes to Watch For
Before you work through the examples, skim the mistake guide so you know which shortcuts and sign errors to avoid.
Worked Examples
Example 1
easySolution
- 1 Step 1: x is assigned 5.
- 2 Step 2: y is assigned 3.
- 3 Step 3: z = x + y = 5 + 3 = 8. Output: 8.
Answer
Example 2
easyPractice Problems
Try these problems on your own first, then open the solution to compare your method.
Example 1
easyExample 2
easyBackground Knowledge
These ideas may be useful before you work through the harder examples.