see declaration of错误

"see declaration of" is an error message that usually occurs in programming when a variable or function is used but it has not been declared or defined. The error message is telling you to go back to where the variable or function is being used and find out where it was supposed to have been declared or defined.

For example, if you have a code that uses a variable called "x" but you have not declared it anywhere in your code, you may get this error message. To fix it, you would need to add a line at the beginning of your code that declares the variable, such as:

int x;

If you provide more specific information about the error message and where it is occurring in your code, I may be able to help you further.