Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:26: error: ‘ifstream’ was not declared in this scope user.cpp:26: error: expected ‘;’ before ‘f’ user.cpp:27: error: ‘ofstream’ was not declared in this scope user.cpp:27: error: expected ‘;’ before ‘g’ user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result