Compilare: user.cpp: In function ‘int main()’: user.cpp:71:9: warning: unused variable ‘x’ [-Wunused-variable] int x; ^ user.cpp:72:9: warning: unused variable ‘len’ [-Wunused-variable] int len; ^ user.cpp:66:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(in_buff,sizeof(char),fSize,fin); ^