Question

1. (02.04 mc)

the code below uses ap exam pseudocode and is intended to swap the values of the variables firstflavor and secondflavor.
line 1: firstflavor ← secondflavor
line 2: temp ← firstflavor
line 3: secondflavor ← temp
which change, if any, is needed for the program to work as expected? (5 points)
○ swap line 2 with line 3.
○ swap line 1 with line 2.
○ swap line 1 with line 3.
○ no change is needed; the code works as expected.

Explanation:

Step1: Analyze current code flaw

Current Line 1 overwrites firstFlavor before its value is saved.

Step2: Identify correct swap order

A valid 3-step swap first saves the original value of firstFlavor to temp, then assigns firstFlavor to secondFlavor, then assigns secondFlavor to temp. Swapping Line 1 and Line 2 fixes this order:

1. temp ← firstFlavor (save original first value)
2. firstFlavor ← secondFlavor (overwrite first with second)
3. secondFlavor ← temp (overwrite second with saved first)

Step3: Verify fix

This corrected order successfully swaps the two variable values as intended.

Answer:

Swap Line 1 with Line 2.