Eroare de compilare in evaluator: user.c:1:18: error: fstream: No such file or directory user.c: In function 'main': user.c:4: error: 'fstream' undeclared (first use in this function) user.c:4: error: (Each undeclared identifier is reported only once user.c:4: error: for each function it appears in.) user.c:4: error: expected ';' before 'f' user.c:6: error: 'f' undeclared (first use in this function) user.c:8: error: 'g' undeclared (first use in this function)