Difference b/w Compiler Interpreter and Assembler

Difference b/w Compiler Interpreter and Assembler

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Here’s a clear and concise comparison between Compiler, Interpreter, and Assembler, including their definitions, differences, and a table for quick revision.

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1. Compiler

• Definition: A compiler is a program that translates the entire source code of a high-level language (like C, C++, Java) into machine code (binary) at once.
• Output: Generates an executable file (.exe).
• Execution Speed: Fast (after compilation).
• Example Languages: C, C++, Java (partially).

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2. Interpreter

• Definition: An interpreter translates line-by-line of source code into machine code and executes it immediately.
• Output: No executable file is created.
• Execution Speed: Slower (interprets each line every time).
• Example Languages: Python, JavaScript, Ruby.

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3. Assembler

• Definition: An assembler converts assembly language (low-level language) into machine code.
• Output: Machine code (binary).
• Used For: Assembly language programming (e.g., using instructions like MOV, ADD).
• Example: MASM (Microsoft Assembler), NASM.

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Comparison Table

Feature	Compiler	Interpreter	Assembler
Input	High-Level Language	High-Level Language	Assembly Language
Output	Machine Code / Executable File	Direct Execution	Machine Code
Execution Style	Translates all at once	Translates one line at a time	Translates all at once
Speed	Fast (after compilation)	Slower (runs line-by-line)	Fast
Error Handling	Shows all errors after compilation	Shows errors one by one	Shows all errors after conversion
Examples	C, C++, Java (JVM compiles bytecode)	Python, JavaScript, BASIC	NASM, MASM

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Summary in One Line:

• Compiler → Full code → Executable
• Interpreter → Line-by-line → Direct Execution
• Assembler → Assembly → Machine Code

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Difference b/w Compiler Interpreter and Assembler

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