Transform the following while loop into an equivalent do loop (make sure it produces the same output).

```
int num = 1;
while (num < 20)
{
num++;
System.out.println(num);
}

```

This code can be written using a do loop as follows:
```
int num = 1;
do
{
num++;
System.out.println(num);
}
while (num < 20);

```