Convert GB to Byte

Question

Steven Young 261

Dim b As Long = 5 * 1024 * 1024 * 1024

Why it's not right?

Castorix31 90,681 Reputation points

2021-06-25T06:59:31.847+00:00
The code you posted is not compilable :

Dim b As Long = 5 1024 1024 * 1024
Steven Young 261 Reputation points

2021-06-25T07:27:49.777+00:00

Yes, why can't it compile?
Steven Young 261 Reputation points

2021-06-25T07:31:37.557+00:00
Dim a As Long = 5368709120 'No problem Dim b Long = 5 * 1024 * 1024 * 1024 'It's not compile

(5*1024*1024*1024 = 5368709120)
Steven Young 261 Reputation points

2021-06-25T10:32:51.36+00:00

Thank you, could you please tell me why?
Viorel 122.6K Reputation points

2021-06-25T11:31:39.873+00:00

5 and 1024 are interpreted as Integer. The “*” operation for such values is also limited to Integer by VB, but the result is larger than the maximum value of Integer, therefore it cannot be computed. If you add “L” to any term, the value and the result becomes a Long, which is enough for 5GB. The “L” suffix is not required in case of 5368709120 because it is clear that this is a large, Long value.

Accepted answer

0 additional answers

Castorix31 90,681 Reputation points

2021-06-25T06:59:31.847+00:00

The code you posted is not compilable :

Dim b As Long = 5 1024 1024 * 1024
Steven Young 261 Reputation points

2021-06-25T07:27:49.777+00:00

Yes, why can't it compile?
Steven Young 261 Reputation points

2021-06-25T07:31:37.557+00:00

Dim a As Long = 5368709120 'No problem Dim b Long = 5 * 1024 * 1024 * 1024 'It's not compile

(5*1024*1024*1024 = 5368709120)
Steven Young 261 Reputation points

2021-06-25T10:32:51.36+00:00

Thank you, could you please tell me why?
Viorel 122.6K Reputation points

2021-06-25T11:31:39.873+00:00

5 and 1024 are interpreted as Integer. The “*” operation for such values is also limited to Integer by VB, but the result is larger than the maximum value of Integer, therefore it cannot be computed. If you add “L” to any term, the value and the result becomes a Long, which is enough for 5GB. The “L” suffix is not required in case of 5368709120 because it is clear that this is a large, Long value.

Answer 1

Viorel 122.6K

Try this:

Dim b As Long = 5 * 1024L * 1024 * 1024

Steven Young 261 Reputation points

2021-06-26T07:22:38.57+00:00

Thank you so much.