C++ 数组指针

#include<iostream>
using namespace std;
double calculate(double x ,double y ,double (*pf[3])(double,double));
double add(double x ,double y);
double att(double x ,double y);
double app(double x ,double y);
int main()
{
    double (*ps[3])(double,double)={add,att,app};
    double a ,b;
    cout<<"Enter a X : "<<endl;
    cin>>a;
    cout<<"Enter a Y : "<<endl;
    cin>>b;
    double tal = 0.0;
    for(int i=0;i<3;i++)
    {//calculate(a,b,(double(**)(double,double)));
                //需要注意这里
        tal = calculate(a,b,(double(**)(double,double))(ps+i));
        cout<<tal<<endl;
    }
    return 0;
}

double calculate(double x ,double y ,double (*pf[3])(double,double))
{
    double temp = 0.0;
    temp = (*pf)(x,y);
    return temp;
}

double add(double x ,double y)
{
    return x+y;
}

double att(double x ,double y)
{
    return x*y;
}

double app(double x ,double y)
{
    return x/y;
}