Compilare: user.cpp: In function ‘int main()’: user.cpp:18:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:23:17: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int k; k <= i; k++) ^