Compilare: user.cpp: In function ‘int getNr()’: user.cpp:45:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(isDigit[c] == 0 && c != '-') ^ user.cpp:55:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(isDigit[c] == 1) ^ user.cpp: In function ‘void readFile()’: user.cpp:85:9: warning: unused variable ‘c’ [-Wunused-variable] int c = 0, len = 0; ^ user.cpp: In function ‘void refillBuff()’: user.cpp:28:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, buffSize, f); ^