Compilare: user.cpp: In function ‘int main()’: user.cpp:35:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:36:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1;i<=n;i++) {fscanf(f,"%d",&v[i]);a[i].x=v[i];a[i].p=i;} ^