c++ - C++错误中的结构初始化

Question

我是 c++ 的新手，我在 visual studio c++ 中运行以下代码

    struct bob
    {
       double a,b;      
       bob(double a,double b);
    }

    int main()
    {
        bob z(2.2,5.6);
        cout<<z.a<<endl;
        keep_window_open();
        return 0;
    }     

当我运行这段代码时，出现以下错误:

错误 1 ​​error LNK2019: unresolved external symbol "public: __thiscall bob::bob(double,double)"(??0bob@@QAE@NN@Z) referenced in function _main C:\drives\Comp-Mech\编程\V.S\C++\projects\E1\E1.obj E1

Answer 1

您需要实现类 bob 的构造函数:

 bob::bob(double a,double b) : a(a), b(b) {}