Complete the sentence: A programming language is used to …

Question

BlackTom AI · Accepted Answer

Programming languages express algorithms as instructions that the CPU ultimately executes, either after translation by a compiler to machine code or at runtime via an interpreter.

1) Relevant knowledge points and concepts
- CPU (central processing unit): executes machine-level instructions (binary opcodes).
- Programming language: a formal language for writing algorithms and program logic (high-level languages like Python, Java, C; low-level like assembly).
- Compiler/assembler/interpreter: tools that translate source code into machine code or intermediate code the CPU can execute.
- Distinction from hardware functions: connecting devices, permanent storage, and analog-to-digital conversion are handled by other hardware or firmware components.

2) Step-by-step reasoning
- A programmer writes source code in a programming language (e.g., C, Java, Python).
- That source code describes operations (control flow, arithmetic, I/O) as human-readable instructions.
- A compiler or assembler converts these instructions into machine code (binary opcodes) that the CPU understands, or an interpreter executes them by issuing CPU-level operations at runtime.
- Therefore the primary use of a programming language is to create instructions that are executed by the CPU.

3) Calculations / intermediate steps
- No numeric calculations required; the logical mapping is: source code -> (compiler/interpreter) -> machine code -> CPU execution.

4) Why the correct answer is correct
- Option (a) directly describes the role of programming languages: to create instructions (programs) that get executed by the CPU after translation. This captures both high-level and low-level language workflows.

5) Why the other options are incorrect
- (b) Allow hardware devices to connect to the motherboard: this is a hardware/physical-interface function (connectors, buses), not a programming language role.
- (c) Save instructions permanently: persistent storage (ROM, flash, disk) handles permanence; programming languages are for writing instructions, not storing them permanently.
- (d) Convert analogue signals to digital signals: that is the job of ADC hardware and signal-processing electronics, not a programming language.

6) Conclusion
The correct answer is (a) create instructions that are executed by the central processing unit (CPU), which matches the provided answer.

Complete the sentence: A programming language is used to …单项选择题

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