Eroare de compilare: user.cpp:1:21: error: ifstream.h: No such file or directory user.cpp:33:2: warning: no newline at end of file user.cpp:3: error: 'ifstream' does not name a type user.cpp:4: error: 'ofstream' does not name a type user.cpp: In function 'void eratostene()': user.cpp:12: error: expected `;' before ':' token user.cpp:12: error: expected `;' before ')' token user.cpp: In function 'void verifica()': user.cpp:19: error: expected `;' before ')' token user.cpp: In function 'int main()': user.cpp:28: error: 'f' was not declared in this scope user.cpp:31: error: 'g' was not declared in this scope