调用有参构造函数的三种方法

#include <iostream>using namespace std;class Test{public:Test(){m_a = 0;m_b = 0;cout<<"无参构造函数"<<endl;}Test(int a)//3种方法{m_a = a;m_b = 0;cout<<"1个参数有参构造函数"<<endl;}Test(int a, int b )//3种方法{m_a = a;m_b = b;cout<<"有参构造函数"<<endl;}Test(const Test&obj){cout<<"赋值构造函数"<<endl;}void print(){cout<<m_a<<endl;cout<<"普通函数"<<endl;}protected:private:int m_a ;int m_b;};void display(){//1.调用有参构造函数方法1//Test t(1,2);//t.print();//1.调用有参构造函数方法2//Test t = (1,2,3);//逗号表达式 取最后一个值//t.print();//1.调用有参构造函数方法3 Test t = Test(1,2);//编译器会产生一个匿名对象//t.print();}int main(){display();system("pause");return 0;}