Compilare: user.cpp: In function ‘int main()’: user.cpp:23:14: warning: right operand of comma operator has no effect [-Wunused-value] cin>>n,m; ^ user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.in","r",stdin); ^ user.cpp:17:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.out","w",stdout); ^ user.cpp:11:13: warning: ‘m’ may be used uninitialized in this function [-Wmaybe-uninitialized] return gcdx(m,n%m); ~~~~^~~~~~~ user.cpp:14:5: note: ‘m’ was declared here int main() ^~~~