Compilare: user.cpp: In function ‘char nextch()’: user.cpp:16:56: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==BUF_SIZE) fread(buf, BUF_SIZE, 1, f), pos=0; ^ user.cpp: In function ‘bool verif(int, int, int, int)’: user.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^