Question

我想使用OOP方式将两个数字相加。我是C ++的新手，因此需要您的帮助。

#include <iostream>
#include <string>

using namespace std;

class RunwalsClass{

    public: // public function
        void setName(string x){
            name = x;
        }
        string getName(){
            return name;
        };

    private: // good programming practice to make it private
        string name;

};

class MyClass{

    public:
        void setSaying(string y){
            CoolSaying = y;
        }
        string getSaying(){
            return CoolSaying;
        }

    private:
        string CoolSaying;
};

class FavSitcom{

    public:
        void setSitcom(string z){
            BreakingBad = z;
        }

        string getSitcom(){
            return BreakingBad;
        }

    private:
        string BreakingBad;
};

class AddClass{

    public:
        void setNumbers(int a, int b){
            int answer = a + b;
        }

        int getAddition(){
            return answer;
        }

    private:
        int answer;

};

int main(){

    RunwalsClass RunwalsObject;
    RunwalsObject.setName("Sir Buckey Wallace");
    cout << RunwalsObject.getName() << endl;

    MyClass MyObject;
    MyObject.setSaying("Preaching to the choir! \n");
    cout << MyObject.getSaying();

    FavSitcom MyNewObject;
    MyNewObject.setSitcom("My favorite Sitcom is: Breaking Bad \n");
    cout << MyNewObject.getSitcom();

    AddClass NewObject;
    NewObject.setNumbers("answer: \n");
    cout << AddObject.getAddition();

    return 0;
}


error: #include <iostream>
#include <string>

using namespace std;

class RunwalsClass{

    public: // public function
        void setName(string x){
            name = x;
        }
        string getName(){
            return name;
        };

    private: // good programming practice to make it private
        string name;

};

class MyClass{

    public:
        void setSaying(string y){
            CoolSaying = y;
        }
        string getSaying(){
            return CoolSaying;
        }

    private:
        string CoolSaying;
};

class FavSitcom{

    public:
        void setSitcom(string z){
            BreakingBad = z;
        }

        string getSitcom(){
            return BreakingBad;
        }

    private:
        string BreakingBad;
};

class AddClass{

    public:
        void setNumbers(int a, int b){
            int answer = a + b;
        }

        int getAddition(){
            return answer;
        }

    private:
        int answer;

};

int main(){

    RunwalsClass RunwalsObject;
    RunwalsObject.setName("Sir Buckey Wallace");
    cout << RunwalsObject.getName() << endl;

    MyClass MyObject;
    MyObject.setSaying("Preaching to the choir! \n");
    cout << MyObject.getSaying();

    FavSitcom MyNewObject;
    MyNewObject.setSitcom("My favorite Sitcom is: Breaking Bad \n");
    cout << MyNewObject.getSitcom();

    AddClass NewObject;
    NewObject.setNumbers("answer: \n");
    cout << AddObject.getAddition();

    return 0;
}

报告的错误：

error: no matching function for call to 'AddClass::setNumbers(const char [10])
note: candidate: void AddClass::setNumbers(int, int)
note: candidate expects 2 arguments, 1 provided.

Answer 1

是的，因此您的函数setNumbers（）需要提供两个整数参数，即NewObject.setNumbers（5，10）;它将数字设置为15。您提供的字符串文字“ answer：\ n”不相同，因此无法编译。

Answer 2

主要，您正在将字符串作为参数传递给setNumbers方法。这行主要是错误的：

     NewObject.setNumbers("answer: \n");

您的setNumbers函数需要声明两个整数。试试：

    int a = 10;
    int b = 5;
    NewObject.setNumbers(a, b);

在OOP学习过程中祝您好运！

编辑：同样，在setNumbers函数中，您不得重新声明答案，因为此变量是类成员。删除int，只需在setNumbers中使用答案即可。

与类以及代码为何给出错误有关

2 个答案: