Compilare: user.cpp: In function ‘int main()’: user.cpp:24:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=n; i++) ^ user.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<=n;j++) ^ user.cpp:29:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==n) sum=1; ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifre5.in","r",stdin); ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifre5.out","w",stdout); ^ user.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&p); ^