Compilare: user.cpp: In function ‘int main()’: user.cpp:20:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &n ); ^ user.cpp:23:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &nr ); ^ user.cpp:20:26: warning: ‘fin’ is used uninitialized in this function [-Wuninitialized] fscanf( fin, "%d", &n ); ^