Compilare: user.cpp: In function ‘int main()’: user.cpp:15:24: warning: for increment expression has no effect [-Wunused-value] for(int i=n-1;i--;i>=0) ^ user.cpp:10:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:12:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a[i]); ^