Compilare: user.cpp: In function ‘int main()’: user.cpp:45: warning: unused variable ‘n’ user.cpp:45: warning: unused variable ‘c’ user.cpp:54: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:63: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result In file included from /usr/include/stdio.h:910, from /usr/include/c++/4.4/cstdio:45, from /usr/include/c++/4.4/fstream:43, from user.cpp:3: In function ‘size_t fread(void*, size_t, size_t, FILE*)’, inlined from ‘int main()’ at user.cpp:55: /usr/include/bits/stdio2.h:285: warning: call to ‘__fread_chk_warn’ declared with attribute warning: fread called with bigger size * nmemb than length of destination buffer