Arrary Size

I might just be too over accustom to vectors, but how do I get the size of an array in C++ again?

I had to do this

Code:

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int num[] = {0, 0, 0, 0};

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to fill up an arrary with only 4 zeros initially. Later on in the code I had to use a for loop to fill up the actual values, but can't remember how to get the size of the arrary so had to start from

Code:

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for int i = 4 - 1;

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Where 4 is the size of the array...

Code:

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sz = sizeof(num)/sizeof(num[0]);

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Just remember that that will only work when you do it in the same scope as you created the array in. For example this wont work as wanted:

Code:

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#include <iostream>
using namespace std;

void func(int ar[])
{
        cout << sizeof(ar)/sizeof(*ar) << endl;
}


int main()
{
        int array[5];
        cout << sizeof(array)/sizeof(*array) << endl;
        func(array);
}

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Will produce this output:
5
1