Compilare: user.cpp: In function ‘int getnr()’: user.cpp:20:10: warning: variable ‘sign’ set but not used [-Wunused-but-set-variable] char sign = 1; ^ user.cpp: In function ‘char nextch()’: user.cpp:12:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, fi); ^