Compilare: user.cpp: In member function ‘void KMP::ReadStrings()’: user.cpp:33:24: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] sir1[m]=sir2[n]=NULL; ^ user.cpp:30:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(sir1,NMAX,fin); ^ user.cpp:31:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(sir2,NMAX,fin); ^