Compilare: main.cpp: In function 'long long int euler(int)': main.cpp:6:17: warning: unused variable 'a' [-Wunused-variable] long long p,a,copie,i; ^ main.cpp:6:19: warning: variable 'copie' set but not used [-Wunused-but-set-variable] long long p,a,copie,i; ^~~~~ main.cpp: In function 'int main()': main.cpp:45:20: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=] printf("%d",sum); ^ main.cpp:34:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.in","r",stdin); ^ main.cpp:35:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.out","w",stdout); ^ main.cpp:38:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^