Why function does not know the array size?

Question

If I write

int main()
{
    int a[100] = {1,2,3,4,};
    cout<

        

Answer 1

No. You are wrong.

If I run your second part of code, it gives 1 on my computer. It's not 400.

#include 

void func(int *a);

using namespace std;

int main()
{
    int a[100] = {1,2,3,4,};
    func(a);
    return 0;
}

void func(int *a)
{
     cout<

Produces

1