为什么第一题执行一个构造函数就执行一个析构函数

  class student{
public:
    student(string name1,string stu_no1,float score1){
        name=name1;
        stu_no=stu_no1;
        score=score1;
        cout<<"2"<<endl;
    }
    ~student(){cout<<"1"<<endl;}
private:
    string name;
    string stu_no;
    float score;
   
};
int main()
{
    student stu[3]={
        student("黎明","187691",90),
        student("丹妮","187692",87),
        student("珍妮","187693",96)};
        return 0;
}
*/
//第二题
class complex{
public:
    complex(double r=0.0,double i=0.0)
    {real=r;imag=i;
    cout<<"2"<<endl;
    }
    ~complex()
    {cout<<"1"<<endl;
    }
private:
    double real;
    double imag;
};
int main()
{complex com[3]={
    complex(1.1,2.2),
    complex(3.3,4.4),
    complex(5.5,6.6)};
    return 0;
}