C中的动态变量声明

Question

I'm a ruby developer and its been long time since I've coded in C. I want to use a datatype in C which behaves like a symbol.

Is this possible?

• Program asks user for name

• User replies - "foobar"

• Program declares an integer with the same name ie

  int foobar;

Answer 1

Unlike in interpreted languages, C does not have a dictionary of variable names at runtime. There exist no variable names at runtime at all. Hence unfortunately it is impossible to do what you want in C.

Answer 2

如果不实现您自己的符号表来模拟所需的行为（本质上，实现您自己的微编程语言），就不可能在 C 中做到这一点。

Answer 3

No. C must know names at compile time.

The best you could do is create your own dictionary of names and values. Much work though.

Answer 4

What do you want to do with the username-as-variable once you have it? What kind of operations would you perform with or on your foobaf variable?

As others have suggested you could use a data structure to dynamically associate the user name with a piece of integer data but knowing what you want to do with it would help inform suggestions as to whether that's even necessary and which data structures and algorithms you might want to look at.