#include <iostream>

void f(int d[],const int sized){ // C++ style
  // empty [] tells compiler d is an array
  // d is passed by reference! 
  // You are dealing with the original array, not with it's copy.
  for (int i=0;i<sized;++i) std::cout<<i<<" "<<d[i]<<"\n";  
}
int main(){
  int j[]={2,4,5}; 
  f(j,3);
}