Assume the variable x has been initialized to an integer value (e.g., x = 3). What does the following statement do?

Question

BlackTom AI · Accepted Answer

The assignment operator evaluates the right-hand side expression and stores that result into the left-hand side variable, so x = x + 2 updates x by adding 2 to its current value.

1. Relevant knowledge points and concepts
- Assignment (=) evaluates the right-hand side (RHS) first, then assigns that value to the left-hand side (LHS) variable.
- The expression x + 2 takes the current value of x and adds 2.
- This is equivalent to the compound-assignment x += 2 in many languages.
- The problem states x is initialized (e.g., x = 3), so RHS is well-defined.

2. Step-by-step reasoning
- Start with the initial value (example) x = 3.
- Evaluate the RHS expression x + 2 using the current x:
  - Retrieve x (which is 3).
  - Compute 3 + 2 = 5.
- Assign the computed result (5) to the variable x on the LHS.
- After the statement executes, x now holds the value 5.

3. Calculations (intermediate steps)
- Given x = 3
- Compute RHS: x + 2 = 3 + 2 = 5
- Perform assignment: x ← 5
- Final state: x = 5

4. Why the correct answer is correct
- The statement explicitly forms a new value by taking the current x and adding 2, then writes that new value back into x. That matches the provided description exactly: “Retrieve the current value for x, add two to it and put the sum back into x.”

5. Why other choices are incorrect
- “This would fail as it is a syntax error”: incorrect because x = x + 2 is valid syntax in virtually all imperative languages if x is declared.
- “Exit the program”: assignment does not terminate execution.
- “Create a function called 'x' and put the value 2 in the function”: assignment does not define functions; it updates a variable.

6. Conclusion
The statement increments x by 2 by computing x + 2 and storing the result in x. This confirms the correct answer: Retrieve the current value for x, add two to it and put the sum back into x.

Assume the variable x has been initialized to an integer value (e.g., x = 3). What does the following statement do?单项选择题

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