C++中class中对私有变量的访问

class A {
    int ia {};
    int ib {};
    int ic {};
public:
    A (int a, int b, int c) : ia(a), ib(b), ic(c) {}  //构造函数
    void seta(int a) { ia = a; }
    void setb(int b) { ib = b; }
    void setc(int c) { ic = c; }
    int geta() const { return ia; }
    int getb() const { return ib; }
    int getc() const { return ic; }
};