Assignment CS Thinking Example 2

Follow the full solution, then compare it with the other examples linked below.

Example 2

easy
What is the difference between `x = 5` (assignment) and `x == 5` (comparison)?

Solution

  1. 1
    Step 1: `x = 5` assigns the value 5 to the variable x. It changes x.
  2. 2
    Step 2: `x == 5` compares x to 5 and returns TRUE or FALSE. It does not change x.
  3. 3
    Step 3: Confusing these is a common bug — using = instead of == in a condition.

Answer

`=` assigns a value; `==` checks for equality. They serve completely different purposes.
The distinction between assignment and comparison operators is fundamental. Many bugs arise from accidentally using one when the other is intended.

About Assignment

The operation of storing a value in a variable. The variable name goes on the left of the assignment operator, and the value or expression goes on the right. The right side is evaluated first, then the result is stored in the variable on the left.

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More Assignment Examples

Example 1 easy

Trace the following code: SET x = 10. SET y = x. SET x = 20. OUTPUT x, y.

Example 3 easy

What is the output? SET a = 3. SET b = 4. SET a = a + b. SET b = a - b. OUTPUT a, b.

Example 4 medium

Trace the values of x and y after each line: SET x = 10 SET y = x + 5 SET x = y * 2 SET y = x - y

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