Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:12: error: ‘scanf’ was not declared in this scope user.cpp: In function ‘void df(int)’: user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:30: error: ‘stdin’ was not declared in this scope user.cpp:30: error: ‘freopen’ was not declared in this scope user.cpp:31: error: ‘stdout’ was not declared in this scope user.cpp:37: error: ‘printf’ was not declared in this scope