If the code is in C#, then there are two errors:

1. The array `arr1` is declared with a negative size. Arrays in C# must have a non-negative size.
2. The loop condition `i > arr1.length()` is incorrect. The loop should continue as long as `i < arr1.length()`.

The following code fixes the errors:

```c#
int[] arr1 = new int[32];
for (int i = 0; i < arr1.Length; ++i)
{
    // do something
}
```

The `++i` and `i++` operators are equivalent in this case. Both increment the value of `i` by 1.

Here is an example of how to use the fixed code:

```c#
int[] arr1 = new int[32];
for (int i = 0; i < arr1.Length; ++i)
{
    arr1[i] = i * i;
}

foreach (int item in arr1)
{
    Console.WriteLine(item);
}
```

Output:

```
0
1
4
9
16
25
36
49
64
81
100
121
144
169
196
225
256
289
324
361
400
441
484
529
576
625
676
729
784
841
```
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