Compilare: user.cpp: In function ‘int read(int&, int)’: user.cpp:23:28: warning: no return statement in function returning non-void [-Wreturn-type] }while(ch>='0' && ch<='9');} ^ user.cpp: In function ‘char nextc(int)’: user.cpp:10:30: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff[x],1,1<<12,fin[x]);} ^