Compilare: user.cpp: In function ‘int main()’: user.cpp:18:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("tamplar.in","r",stdin); ^ user.cpp:19:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("tamplar.out","w",stdout); ^ user.cpp:22:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp: In function ‘void prod(int*, int)’: user.cpp:14:13: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] v[0] = i-1; ^ user.cpp: In function ‘int main()’: user.cpp:21:20: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] a[0] = a[i] = 1; ^