easyMultiple Choice
FC0-U71 Practice Question: Best describes the difference between a compiler…
Which of the following best describes the difference between a compiler and an interpreter?
⚠ Common exam trap
CompTIA often tests the common misconception that interpreters are faster because they skip the compilation step, but the trap here is confusing the order of translation and execution, leading candidates to reverse the definitions of compiler and interpreter.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A compiler translates the entire source code into machine code before execution; an interpreter executes code line by line.
A compiler translates the entire source code into machine code before execution, producing a separate executable. An interpreter translates and executes source code line by line at runtime. Compiled programs generally run faster at execution because translation is done ahead of time. Therefore, option C is correct. Option A confuses development speed (no separate compile step) with execution speed. Option B reverses the two definitions, and option D incorrectly describes when syntax checking occurs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Compiled programs run slower than interpreted programs.
Why it's wrong here
Compilation produces machine code ahead of execution, so compiled programs generally run faster, not slower; interpretation adds per-line overhead at runtime. This option inverts the performance relationship, making it an incorrect description of the difference.
- ✗
A compiler executes code line by line; an interpreter translates the entire program at once.
Why it's wrong here
A compiler translates the whole program into machine code before execution, whereas an interpreter executes source code line by line at runtime — this option reverses those roles. It is tempting because both convert high-level source into executable instructions, so the pairing feels familiar; the distinction lies in translation timing and output, not execution order.
- ✓
A compiler translates the entire source code into machine code before execution; an interpreter executes code line by line.
Why this is correct
Compilation converts the whole source file to machine code in one pass before any execution, so runtime errors surface after translation. Interpretation decodes and executes each statement sequentially at runtime. This whole-program versus line-by-line axis is exactly the distinction the question asks for.
- ✗
A compiler checks for syntax errors at runtime; an interpreter checks at compile time.
Why it's wrong here
This reverses the actual timing: compilers detect syntax errors before execution, during translation, while interpreters encounter them at runtime as each statement is parsed. It is tempting because both tools do report syntax errors, so the pairing sounds plausible; the axis of difference is when parsing occurs, not whether checking happens.
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