Compilare: user.cpp: In member function ‘int ifbuffer::getnr()’: user.cpp:89:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( !isDigit[c] && c != '-' ) ^ user.cpp:96:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( isDigit[c] ) { ^ user.cpp: At global scope: user.cpp:131:25: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings] ifbuffer fin("ksecv3.in"); ^ user.cpp:132:27: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings] ofbuffer fout("ksecv3.out"); ^ user.cpp: In member function ‘void ifbuffer::refill()’: user.cpp:73:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( text, 1, size, file ); ^