CPP

how to pass an array by reference in C++

void func (int arr[])
{
  for(int i=0;i<arr.size();i++)
    arr[i]=1;
}
int main()
{
	int arr[100];
  	func(arr);
}

how to pass arrays by reference c++

#include <iostream>
using namespace std;
void show( int *num) {
   cout<<*num;
}
int main() {
   int a[] = {3,2,1,6,7,4,5,0,10,8};
   for (int i=0; i<10; i++) {
      show (&a[i]);
   }
   return 0;
}