Compilare: user.cpp: In function ‘void Reverse()’: user.cpp:12:9: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] p[n]=NULL; ^ user.cpp: In function ‘int main()’: user.cpp:38:9: warning: unused variable ‘i’ [-Wunused-variable] int i,match; ^ user.cpp:36:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("palindrom.in","r",stdin); ^ user.cpp:37:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("palindrom.out","w",stdout); ^ user.cpp:39:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); ^