From the point of view of C lexemes minus this?

Question

Programming

From the point of view of C lexemes, are the minus signs in the first and second expressions different signs?
I break the C code into tokens and assign the minus sign to a lexeme called "operations".
1) int a = -1;
2) int a = 2-1;
Minus in both cases is it a separate lexeme? If so, how do you tell the resolver that -1 is an indivisible structure?

Answer 1

Minus in both cases is it a separate lexeme?

This is one and the same separate token, which, due to the context, turns into different operators.
-1 in terms of the C standard is an expression: unary minus applied to a constant, not an indivisible structure.

Answer 2

We'll have to teach the recognizer to perform operations on constants. Then both -1 and 2-1 will be compile-time constants, while (-x) and x-1 will be the result of various minus operations (which don't have to be related in any way).

Answer 3

From the point of view of the language, these are two different operators:
Unary minus and binary minus.