ISO C and signed literal constants
问题 I just started to read the ISO C 2011 standard , well the last public draft of it [1] , and realized that in the C Lexical Grammer [1][458ff.] all (literal) numerical constants are unsigned. Does that mean that the Compiler interpret a signed numerical constant (like -5.1E10 or -1) as a call of the corresponding unary-operator ? e.g -1 <=> -(1) , +512 <=> +(512) UPDATE: My fault, "all (literal) numerical constants are unsigned" I mean "all (literal) numerical constants are non-negative"