Compilare: user.cpp:13: warning: this decimal constant is unsigned only in ISO C90 user.cpp:22: warning: this decimal constant is unsigned only in ISO C90 user.cpp:64: warning: this decimal constant is unsigned only in ISO C90 user.cpp:64: warning: this decimal constant is unsigned only in ISO C90 user.cpp: In function ‘void citire()’: user.cpp:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:126: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void back()’: user.cpp:104: warning: ‘as’ is used uninitialized in this function