Compilare: user.cpp: In function ‘int main()’: user.cpp:36:16: warning: variable ‘fout’ set but not used [-Wunused-but-set-variable] FILE *fin,*fout; ^ user.cpp:39:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:43:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&temproot,&tempchild); ^