Compilare: user.cpp: In function ‘int main()’: user.cpp:21:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x%k==n) { ^ user.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((x*10+2)%k==n) { ^ user.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((x*10+3)%k==n) { ^ user.cpp:38:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((x*10+5)%k==n) { ^ user.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((x*10+7)%k==n) { ^ user.cpp:10:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifre4.in","r",stdin); ^ user.cpp:11:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifre4.out","w",stdout); ^ user.cpp:12:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:15:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^