Which translator executes source code line by line at runtime?

Which translator executes source code line by line at runtime?

• A. Compiler
• B. Interpreter
• C. Assembler
• D. Linker

Answer: (B)

An interpreter reads the program’s source code and executes each statement as the program runs, processing one line at a time. This is why it can execute code directly without producing a separate executable first. In contrast, a compiler translates the entire program into machine code before execution begins, creating a standalone executable. An assembler converts assembly language into machine code, not running the original source line by line. A linker doesn’t translate at runtime; it combines object files into a single unit after compilation. So, executing source code line by line at runtime is a hallmark of an interpreter.

An interpreter reads the program’s source code and executes each statement as the program runs, processing one line at a time. This is why it can execute code directly without producing a separate executable first. In contrast, a compiler translates the entire program into machine code before execution begins, creating a standalone executable. An assembler converts assembly language into machine code, not running the original source line by line. A linker doesn’t translate at runtime; it combines object files into a single unit after compilation. So, executing source code line by line at runtime is a hallmark of an interpreter.