It does not have any argument. Note that - If we do not create constructor in user defined class. Then compiler automatically inserts a constructor with empty body in compiled code. We can also define constructor outside the class. It does not have any return type. ...
我們發現以上程式compile沒問題,執行也沒問題,唯一遺憾的是getI()的private int i是個亂數,因為synthesized default Constructor只會對class中的class Type加以初始化,對於built-in type則不會初始化,所以int i還是亂數,但string s因為是library type,非built-in type,所以已經初始化成空字串。這告訴我們,若data ...
the implicit default constructor of the class is nontrivial and the compiler needs to synthesize a default constructor for the containing class. This synthesis, however, takes place only if the constructor actually needs to be invoked.
26行的寫法是常犯的錯,Compiler會認為foo為一function,回傳Foo型別object,這算是C++蠻tricky的地方,所以正確的寫法是27行,不加上(),或28行寫法也可以,先利用Default Constructor建立一個temporary object,再使用Copy Constructor將object copy給foo,不過這是使用Copy-initialization的方式,和27行使用Direct-initialization...
Learn: What is the Default Constructor (Zero Argument Constructor) in C++ programming language, how default constructor defines with an Example? In the last post, we have discussed what the constructor is in C++ programming and what are the types of constructor?
Like all functions, a constructor can have default arguments. They are used to initialize member objects. If default values are supplied, the trailing arguments can be omitted in the expression list of the constructor. Note that if a constructor has any arguments that do not have default values...
Constructor default-public and private variables 我知道java并且我现在学习c。我比其他语言更容易学习它有很多相同的东西。我的问题是在一本书的类上有一个完整的构造函数,但我没有在任何地方面对默认构造函数.有 c 默认构造函数,如果是,我应该写吗?另外,我想测试一些东西,在这个类上有 public: 和它的下面有变...
错误提示说得很清楚了，没有合适的构造函数 你的Graduate类的构造函数是 Graduate(string n,string s,int a,string t,float sc,float w):Person(n,s,a),Teacher(n,s,a,t),Student(n,s,a,sc),wages(w){} 而你生成对象时 Graduate g; 参数表为空， 所以你得按构造函数的参数表，传入...
派生类的构造函数改成 derive::derive(float i) : base(i){cout<<i<<endl;} 就行了 错误原因：base没有默认的无参构造函数，所以派生类在构造的时候，不知道怎么构造基类
他是说你的构造函数是有参数的。要想程序通过，可以在类中加一个默认的构造函数就可以了。class CRange { public:CRange(){};CRange(int a,int b){ width=a;height=b;};