Can special symbols be used for C user identifiers?

C language identifiers cannot use special symbols except underscores (_). Special symbols are often operators or characters with special meanings, and using them in identifiers can lead to compiler confusion. Develop good habits of using underscores to enhance readability, but don't abuse it. C language is case sensitive, so it should be consistent when naming. Specificational identifier naming is conducive to code readability and maintenance, and the sample code demonstrates good naming practices.

Can special symbols be used for C user identifiers? The answer is: You can't use it casually! This cannot be summarized by a simple sentence "No". We have to talk in depth, otherwise you may get lost by writing code in the future.

To put it bluntly, the C language naming rules for identifiers (variable names, function names, etc.) are a set of conventional "roots" for the past. This rule is not casually determined, it is related to the readability, maintainability of the code, and even the "mood" of the compiler. If you violate it, the compiler may directly show you the face, and the error will drive you crazy.

Those "special symbols", such as $ , # , % , & etc., are mostly operators or characters with special meanings in C language. If you stuff them into the identifier, the compiler will be confused: Is this thing a variable name or an operator? It cannot distinguish, so it directly reports an error.

For example, you try to define a variable int my$variable = 10; . The compiler is likely to give you an error prompt similar to "invalid identifier". This is not something I'm talking nonsense, you'll know it just by trying it.

Isn’t that even a single special symbol cannot be used? Neither. The only special symbol that is allowed to be used in the identifier is the underscore_ _ This thing is relatively "honest" and will not conflict with other operators. And it is also often used to enhance the readability of identifiers, such as student_name that looks clearer than studentname , right? This is a good habit, and I strongly recommend that you develop it.

Speaking of this, I will add some experience. Although underscores can be used, they cannot be abused. The identifier name should be concise and clear, and you should know the meaning of it. Don't use a bunch of underscores to make your name look like a book of heaven, as it will make your code difficult to maintain and you won't understand it yourself in the future. Imagine how you look back at the code you wrote in a few months and see a variable name like ___my_super_duper_important_variable___ ? Do you want to slap yourself?

In addition, C is case sensitive. myVariable and myvariable are two completely different variables. Therefore, when naming, you should pay attention to uppercase and uppercase and lowercase cases and maintain consistency. This seems to be a detail, but it is an effective way to avoid bugs.

Finally, I'll show you another piece of code and experience the standard identifier naming:

 <code class="c">#include <stdio.h> int main() { int student_age = 20; char student_name[50] = "John Doe"; float student_gpa = 3.8; printf("Student Name: %s\n", student_name); printf("Student Age: %d\n", student_age); printf("Student GPA: %.1f\n", student_gpa); return 0; }</stdio.h></code>

In this code, all identifiers are underscores to separate words, making them clear and easy to understand. This is the programming style I recommend. Remember, writing code is not just to make the compiler run, but more importantly, it is to make your code easily understandable by others (including you in the future). This is the real way to programming.

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