如何将一个 class 的 function 的结果传递给另一个？

Question

所以我有两个类，即ForceSolver和FrictionContact 。 我想将来自 class ForceSolver 的function的可变force的结果 (10) 传递给class FrictionContact 。 例如：

class ForceSolver

class ForceSolver
{
    public:
        int force;
        int mass = 5;
        int acceleration = 2;

        void solveSystem ();
    };

void ForceSolver::solveSystem()
{
    force = mass * acceleration;
    std::cout << "Force is: " << force;
}

class 摩擦接触

class FrictionContact : public ForceSolver
{
public:
    void printForce();
};

void FrictionContact::printForce()
{
    //print force;
    std::cout << force;
}

主文件

int main()
{
    FrictionContact contact;
   
    contact.printForce();
}

我想知道如何实现这一目标。

Answer 1

我认为在printForce()之前你应该做solveSystem() ，否则，将打印未初始化的值

class ForceSolver
{
public:
    int force;
    int mass = 5;
    int acceleration = 2;

    void solveSystem ();
};

void ForceSolver::solveSystem()
{
    force = mass * acceleration;
    // std::cout << "Force is: " << force;
}

class FrictionContact : public ForceSolver
{
public:
    void printForce();
};

void FrictionContact::printForce()
{
    // print force;
    std::cout << force;
}

int main()
{
    FrictionContact contact;
    contact.solveSystem();
    contact.printForce();
}