C++/C 构造函数报错

Question

下面的类是对的， 

class Member{
const char *ms;
public:
    Member(const char * s){
        cout << "Member(const char* s): " << s << endl;
        ms=s;
    }
    ~Member(){
        cout << "~Member(): " << ms << endl;
    }

};

class Test{
    Member mA;
    Member mB;
public:
    Test() : mB("mB"), mA("mA") {
    Test(){
        cout << "Test(): " <<  endl;
    }
    ~Test(){
        cout << "~Test(): " <<  endl;
    }

};

 

我改了一下，改成如下，报错error: no matching function for call to 'Member::Member()'：

class Member{
const char *ms;
public:
    Member(const char * s){
        cout << "Member(const char* s): " << s << endl;
        ms=s;
    }
    ~Member(){
        cout << "~Member(): " << ms << endl;
    }

};

class Test{
    Member mA;
    Member mB;
public:
    //Test() : mB("mB"), mA("mA") {
    Test(){
        mB="mB";
        mA="mA";
        ;
        cout << "Test(): " <<  endl;
    }
    ~Test(){
        cout << "~Test(): " <<  endl;
    }

};

Answer 1

类必须有默认构造函数，就是没有参数的构造函数。