#include <iostream>

using namespace std ;

typedef const double* (*FUN[3])(const double *, int) ;

const double* call_001(const double ar[], int n) ;
const double* call_002(const double [], int) ;
const double* call_003(const double *, int) ;

int main(int argc, char *argv[])
{
    const double *rst = NULL ;      // 作為返回值使用
    double num[10] = { 0.00, 1.11, 2.22, 3.33, 4.44, 5.55, 6.66, 7.77, 8.88, 9.99 } ; 

    const double* (*fp[3])(const double *, int) = { call_001, call_002, call_003 } ;    // 定義函式指標陣列 fp 並初始化為
    for ( int i = 0; i < 3; i++ )
    {   
        rst = (*fp[i])(num, 3) ;
        cout << *rst << endl ;
    }   

    cout << "--------------- 分界線 ---------------" << endl ;

    FUN *fp_t = &fp ;                       // 此處定義了一個函式指標陣列的指標
    for ( int i = 0; i < 3; i++ )
    {   
        rst = (*(*fp_t)[i])(num, 3) ;
//      rst = (*fp_t)[i](num, 3) ;          // It's ok ..
        cout << *rst << endl ;
    }   
    
    return 0 ; 
}

const double* call_001(const double ar[], int n)
{
    return &ar[n] ;
}

const double* call_002(const double ar[], int n)
{
    return ar+n ;
}

const double* call_003(const double *ar, int n)
{
    return ar+n ;
<span style="font-family:SimHei;font-size:14px;">}
</span>