class Test
{
public:


   /* Test(int a, int b, int c)
    {
        m_A = a;
        m_B = b;
        m_C = c;
    }*/

    Test(int a, int b, int c):m_A(a), m_B(b), m_C(c)        //等同于上面 
    {}

    Test():m_A(10), m_B(20),m_C(30)         //给定默认参数的构造函数
    {}

    int m_A;
    int m_B;
    int m_C;
};