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3. How does an assembler work? An assembler translates assembly language code into machine code. It reads the assembly language program (source code) line by line, converting each mnemonic instruction and symbolic address into its corresponding binary machine code. The output is an object file containing machine-executable instructions. $\boxed{\text{An assembler translates assembly language into machine code.}}$

4. Why is the fourth generation language easiest of all the languages? Fourth-generation languages (4GLs) are considered the easiest because they are designed to be closer to natural human language and focus on what needs to be done rather than how to do it. They often use graphical interfaces, simple commands, and non-procedural approaches, requiring less detailed programming knowledge from the user. $\boxed{\text{4GLs are easier due to their natural language-like syntax and focus on results, not detailed steps.}}$

5. What is a language processor? A language processor (also known as a language translator) is a type of system software that converts a program written in one programming language (source code) into another programming language (target code), typically machine code, so that a computer can understand and execute it. Examples include compilers, interpreters, and assemblers. $\boxed{\text{A language processor translates programming code into a form a computer can execute.}}$