Question

This is my example:

#include "stdafx.h"
#include <iostream>
using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
    int ar[][3] = {1, 2, 3, 4, 5, 6, 7};
    //cout << int[3]<<endl; // error C2062: type 'int' unexpected.
    cout << "sizeof(ar) / sizeof(int[3])  "<< sizeof(ar) / sizeof(int[3]) << endl;; 

    system("pause");

    return 0;
}

It is from a book, though no explanation was given. What is int[3] here and why it works only as an argument of sizeof in this case?

Answer 1

int[3] is a type declaration that represents an array of three integers.

Your commented code gives an error because you can’t use a type as a variable.