c++Not quite sure, is the last statement no fuction could call?

9.2 Suppose we have defined the following functions: void moo(int); void moo(int, double); void moo(const string); void moo(int, int, double); void moo(int, double, double); Which function will be called in the statement moo (43.8)? How about the following statements moo(11,11) moo("hey"); moo(7,8,9) moo(6.3,0,1)