数组名和指针相同吗？

/*
  数组名和指针相同吗？ 
*/

#include <iostream>
#include <cstdlib>
#include <cstdio>

using namespace std;
int a[][3] = {{1, 2, 3}, {1, 2, 3}, {4, 5, 6}, {3, 4, 5}};
int sizef(int b[][3])
{
    cout << sizeof(b) << endl;
    cout << sizeof(b[0]) << endl;
    cout << sizeof(b)/sizeof(b[0]) << endl;        
}

int main(void)
{
 //   int a[][3] = {{1, 2, 3}, {1, 2, 3}, {4, 5, 6}, {3, 4, 5}};
    

    cout << sizeof(a) << endl;
    cout << sizeof(a[0]) << endl;
    cout << sizeof(a)/sizeof(a[0]) << endl; 
    cout << "***********" << endl;
    sizef(a);   
//    cout << sizef(a) << endl;
    
    system("pause");
    return 0;
 }
 

上面的程序的结果是： 48 12 4

4 12 0