Compilare: user.cpp: In function ‘int main()’: user.cpp:149:17: warning: unused variable ‘type’ [-Wunused-variable] int type = nextnum(), x = nextnum(); ^ user.cpp:144:13: warning: unused variable ‘inserted’ [-Wunused-variable] int inserted = 0; ^ user.cpp: In function ‘char nextch()’: user.cpp:13:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^