Compilare: user.cpp: In function ‘void readandturn()’: user.cpp:60:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y,z; ^ user.cpp: In function ‘int main()’: user.cpp:73:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In member function ‘void instream::advance()’: user.cpp:52:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^ user.cpp: In function ‘int main()’: user.cpp:74:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("brazi.out","w",stdout); ^ user.cpp: In constructor ‘instream::instream(const char*)’: user.cpp:30:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^