Compilare: user.cpp: In function ‘int main()’: user.cpp:43:44: warning: operation on ‘poz’ may be undefined [-Wsequence-point] S[poz]=cifra[S[poz++]-'a']+'a'-1; ^ user.cpp:72:44: warning: operation on ‘poz’ may be undefined [-Wsequence-point] S[poz]=cifra[S[poz++]-'a']+'a'-1; ^ user.cpp:23:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("criptare2.in","r",stdin); ^ user.cpp:24:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("criptare2.out","w",stdout); ^