Compilare: main.cpp: In function 'int evaluate_call(char*, char*)': main.cpp:124:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < arg_names.length(); i++) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:136:32: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(to_eval, LMAX, stdin); ^ main.cpp: In function 'int main()': main.cpp:165:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("apel.in", "r", stdin); ^ main.cpp:166:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("apel.out", "w", stdout); ^