Eroare de compilare: user.cpp:1: error: expected constructor, destructor, or type conversion before '<' token user.cpp: In function 'int numar(int)': user.cpp:17: warning: unused variable 'i' user.cpp: In function 'int main()': user.cpp:33: error: 'stdin' was not declared in this scope user.cpp:33: error: 'freopen' was not declared in this scope user.cpp:34: error: 'stdout' was not declared in this scope user.cpp:35: error: 'a' was not declared in this scope user.cpp:35: error: 'b' was not declared in this scope user.cpp:35: error: 'scanf' was not declared in this scope user.cpp:36: error: 'printf' was not declared in this scope