Eroare de compilare in evaluator: user.c:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'a' user.c: In function 'main': user.c:24: error: 'a' undeclared (first use in this function) user.c:24: error: (Each undeclared identifier is reported only once user.c:24: error: for each function it appears in.) user.c:24: error: 'true' undeclared (first use in this function) user.c:30: error: 'false' undeclared (first use in this function)