Compilare: main.cpp: In function 'int main()': main.cpp:9:15: warning: variable 'fout' set but not used [-Wunused-but-set-variable] FILE *fin, *fout ; ^~~~ main.cpp:12:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d",&n ) ; ^ main.cpp:16:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x ) ; ^ main.cpp:28:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &n ) ; ^