Which two statements are true regarding the creation of a default constructor？（） A、 The default constructor initializes method variables.B、 The default constructor invokes the no-parameter constructor of the superclass.C、 The default constructor initializes the instance variables declared in the class.D、 If a class lacks a no-parameter constructor，， but has other constructors， the compiler creates a default constructor.E、 The compiler creates a default constructor only when there are no other constructors for the class.
Which two statements are true regarding the creation of a default constructor？（）
- A、 The default constructor initializes method variables.
- B、 The default constructor invokes the no-parameter constructor of the superclass.
- C、 The default constructor initializes the instance variables declared in the class.
- D、 If a class lacks a no-parameter constructor，， but has other constructors， the compiler creates a default constructor.
- E、 The compiler creates a default constructor only when there are no other constructors for the class.
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有如下程序:includeUsing namespace std;Class Demo{public:Demo(){cout 有如下程序： #include＜iostream.h＞ Using namespace std； Class Demo { public： Demo(){ cout＜＜“default constructor\n”；} Demo(const Demo x){ cont＜＜“copy constructor\n”；} }； Demo usercode(Demob){Demo c(b)；return c;} int main() {A．1和1B．1和2C．2和3D．2和4
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以下程序的输出结果是_____。 include class object {private:int val; public:objec 以下程序的输出结果是_____。include＜iostream.h＞class object{ private:int val;public:object( ) ;object(int i) ;～object( ) ;};object: :object( ){ val＝0;cout ＜ ＜ "Default constructor for object" ＜ ＜ endl;}object: :object(int i){ val＝i;cout ＜ ＜ "Constructor for object" ＜ ＜ val ＜ ＜ endl;}object: :～object( ){ cout ＜ ＜ "Destructor for object" ＜ ＜ val ＜ ＜ endl;}class container{ private:object one;object two;int data;public:container( ) ;container(int i,int j,int k) ;～container( ) ;};container: :container( ){ data＝0;cout ＜ ＜ "Default constructor for container" ＜ ＜ endl;}container: :container(int i,int j,int k) :two(i) ,one(j){ data＝k;cout ＜ ＜ "Constructor for container" ＜ ＜ endl;}container: :～container( ){ cout ＜ ＜ "Destructor for container" ＜ ＜ endl;}void main( ){ container anObj(5,6,10) ;}
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