Help me in c++

Question

How could i separate it into 3 files
interface -implementation- source code

#include <iostream>
using namespace std;
void Array_Test(int x[]);
void Array_Test1(int* y);
int main() {
int array[ ] = {1, 2, 3 };
Array_Test(array); // function Array_Test1(array);
for (int i = 0; i < 3; i++)
cout << array[i]<< endl;
return 0;
}
void Array_Test(int x[]) {
for (int i = e; i < 3; i++)
x[i] =2* x[i];
}
void Array_Test1(int* y) {
for (int i = 0 ; i < 3; i++) {
*y = 2 * (*y);
y++; }
}

Answer 1

There's a chapter covering that topic in the tutorial

https://www.sololearn.com/learn/CPlusPlus/1955/