Variable CS Thinking Example 1
Follow the full solution, then compare it with the other examples linked below.
Example 1
easyTrace: SET x = 7. SET y = x + 3. SET x = y * 2. OUTPUT x, y.
Solution
- 1 Step 1: x = 7.
- 2 Step 2: y = 7 + 3 = 10.
- 3 Step 3: x = 10 * 2 = 20. Output: x = 20, y = 10.
Answer
x = 20, y = 10.
Variables are named containers for storing values. When we reassign a variable, the old value is replaced. Other variables that used the old value are not affected.
About Variable
A named container in a program that stores a value, which can be read, updated, or replaced. Variables have a name (identifier), a value (the data stored), and in many languages a type (what kind of data it holds).
Learn more about Variable →More Variable Examples
Example 2 medium
Show how to swap the values of two variables a and b using a temporary variable. Trace with a = 5, b
Example 3 easyWhat is the output? SET score = 0. SET score = score + 10. SET score = score + 5. OUTPUT score.
Example 4 mediumTrace this swap algorithm: SET A = 3. SET B = 8. SET temp = A. SET A = B. SET B = temp. What are A a