编程用英语命名的时候，万一那些单词成为关键字了怎么办？
It's a perfectly valid concern. When you're crafting code, especially in languages like Python, Java, or C++, you're often thinking about clear, descriptive names for your variables, functions, and classes. The last thing you want is for that carefully chosen word to suddenly have a special, predefined meaning within the language itself, causing your code to either refuse to compile or behave in an entirely unexpected way.
Think of it like trying to name a pet. You want a name that's unique, memorable, and maybe even reflects the pet's personality. But what if you decide to name your cat "Return"? Well, in many programming languages, "return" isn't just a word; it's a command that tells a function to send a value back to where it was called from. So, if you try to declare a variable or define a function named "return," the language's interpreter or compiler will likely get confused. It hears "return" and immediately thinks you're trying to execute that command, not use it as an identifier. This confusion typically manifests as a syntax error – the code just won't run because the rules have been broken.
It's not just about simple commands either. Languages have reserved words that do much more significant work. For instance, consider the word "if." This is fundamental for controlling the flow of your program, allowing you to make decisions. If you were to try and name a variable `if`, the language wouldn't know if you were talking about the conditional statement or your variable. This ambiguity is why the language reserves these words for their specific purposes. Other examples might include words like `for` (for loops), `while` (another type of loop), `class` (to define blueprints for objects), `public` or `private` (for access control in objectoriented programming), and `new` (to create instances of objects).
So, what's the practical implication for a programmer? It means you need to be aware of the set of keywords for the language you're working with. Most integrated development environments (IDEs) and text editors are incredibly helpful here. They'll often highlight keywords in a different color, making them stand out. If you try to use a keyword as a variable or function name, the editor will likely flag it immediately, either by not coloring it as a keyword or by issuing a warning or error as you type.
If you find yourself wanting to use a word that turns out to be a keyword, the solution is straightforward: choose a slightly different name. This could involve adding a prefix or suffix, using an abbreviation, or picking a completely different but equally descriptive word. For example, if you wanted to track the "return" value of something, you might name your variable `returnValue`, `resultValue`, or `finalOutcome`. The key is to maintain clarity and meaning while adhering to the language's rules. It's a small hurdle, but a necessary one to ensure your code can be understood and executed correctly by the machine.
Think of it like trying to name a pet. You want a name that's unique, memorable, and maybe even reflects the pet's personality. But what if you decide to name your cat "Return"? Well, in many programming languages, "return" isn't just a word; it's a command that tells a function to send a value back to where it was called from. So, if you try to declare a variable or define a function named "return," the language's interpreter or compiler will likely get confused. It hears "return" and immediately thinks you're trying to execute that command, not use it as an identifier. This confusion typically manifests as a syntax error – the code just won't run because the rules have been broken.
It's not just about simple commands either. Languages have reserved words that do much more significant work. For instance, consider the word "if." This is fundamental for controlling the flow of your program, allowing you to make decisions. If you were to try and name a variable `if`, the language wouldn't know if you were talking about the conditional statement or your variable. This ambiguity is why the language reserves these words for their specific purposes. Other examples might include words like `for` (for loops), `while` (another type of loop), `class` (to define blueprints for objects), `public` or `private` (for access control in objectoriented programming), and `new` (to create instances of objects).
So, what's the practical implication for a programmer? It means you need to be aware of the set of keywords for the language you're working with. Most integrated development environments (IDEs) and text editors are incredibly helpful here. They'll often highlight keywords in a different color, making them stand out. If you try to use a keyword as a variable or function name, the editor will likely flag it immediately, either by not coloring it as a keyword or by issuing a warning or error as you type.
If you find yourself wanting to use a word that turns out to be a keyword, the solution is straightforward: choose a slightly different name. This could involve adding a prefix or suffix, using an abbreviation, or picking a completely different but equally descriptive word. For example, if you wanted to track the "return" value of something, you might name your variable `returnValue`, `resultValue`, or `finalOutcome`. The key is to maintain clarity and meaning while adhering to the language's rules. It's a small hurdle, but a necessary one to ensure your code can be understood and executed correctly by the machine.
网友意见
C#这么多年加了这么多关键词，全部都是上下文关键词，没有一个会影响之前的程序的……
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