Borderou de evaluare (job #496230)

Compilare: user.cpp: In member function 'char input_parser::next()': user.cpp:45:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function 'int main()': user.cpp:83:9: warning: unused variable 'nod' [-Wunused-variable] user.cpp: In member function 'char input_parser::next()': user.cpp:46:65: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]