错误：没有匹配的函数调用 [英] error: no matching function for call to

问题描述

遇到我的错误...

在构造函数中NumGame :: NumGame（int&）'：
错误： 'category :: Category（）'

"In constructor 'NumGame::NumGame(int&)': error: no matching function for call to 'Category::Category()'"

Ive看了一些类似的问题，但似乎找不到答案。我有一个基类Category，NumGame是继承自它，但不能编译。

Ive looked at a few similar questions here but cant seem to find an answer. I have a base class Category and NumGame is inherited from it but wont compile.

class Category {

public:
    void virtual selection(int&);
    Category(int&);
    virtual ~Category(){};
private:
    int myRandNum;
};

Category::Category(int& a){
    myRandNum = a;
}

void Category::selection(int& a){
    cout << "I am NumGame version number... " << a << endl;
    cout << "Now Im playing... " << myRandNum << endl;
}

class NumGame : public Category {

public:
    void selection(int&);
    NumGame(int&);
    ~NumGame(){};
private:
    int myRandNum;
};

NumGame::NumGame(int& b){
    myRandNum = b;
}

void NumGame::selection(int& b) {

}

推荐答案

类别没有默认构造函数，因此您需要提供参数构建基本对象的基础对象：

Category does not have a default constructor, so you need to supply arguments when constructing the Category base object of NumGame:

NumGame::NumGame(int& b) :
    Category(b)
{
    myRandNum = b;
}

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