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| Alexander Corner | said | Needs to be tested | 3 months, 2 weeks ago |
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Alexander Corner 3 months, 2 weeks ago
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Created this.| Name | Status | Author | Last Modified | |
|---|---|---|---|---|
| ISBN-10 | Needs to be tested | Alexander Corner | 03/01/2025 13:00 | |
| ISBN-13 | Needs to be tested | Alexander Corner | 03/01/2025 13:00 |
| Name | Type | Generated Value |
|---|
| x1 | integer |
8
|
||||
| x2 | integer |
0
|
||||
| x3 | integer |
10
|
||||
| x4 | integer |
5
|
||||
| x5 | integer |
7
|
||||
| x6 | integer |
9
|
||||
| x7 | integer |
8
|
||||
| x8 | integer |
3
|
||||
| x9 | integer |
10
|
||||
| check_digit | number |
9
|
||||
| parity | matrix |
matrix([10,9,8,7,6,5,4,3,2])
|
||||
| digits | matrix |
Matrix of size 9×1
|
||||
| check | number |
2
|
||||
| x1' | string |
8
|
||||
| x2' | string |
0
|
||||
| x3' | string |
X
|
||||
| x4' | string |
5
|
||||
| x5' | string |
7
|
||||
| x6' | string |
9
|
||||
| x7' | string |
8
|
||||
| x8' | string |
3
|
||||
| x9' | string |
X
|
||||
| ISBN | string |
80X57983X?
|
Generated value: integer
- digits
- x1'
This variable doesn't seem to be used anywhere.
Information only
Ask the student a question, and give any hints about how they should answer this part.
ISBN-10 is an error-correcting code which, until 2007, was used to assign a unique identifier to every published book. It is now superseded by ISBN-13, but here we look at how it works.
Each ISBN-10 code is a ten-digit number, using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, X, where X stands for 10. All calculations are performed modulo 11. E..g, 147676669X.
The last digit is a check digit, which is calculated based on the previous nine digits. Let xi represent the digit in position i of the ISBN, e.g., in 0131862391 we have x1=0, x2=1, x3=3, etc. Then, for an ISBN x1x2x3x4x5x6x7x8x9x10, the following checksum must be satisfied:
10x1+9x2+8x3+7x4+6x5+5x6+4x7+3x8+2x9+1x10≡0mod11.
E.g., for 0131862391 we get
(10×0)+(9×1)+(8×3)+(7×1)+(6×8)+(5×6)+(4×2)+(3×3)+(2×9)+(1×1)=154=14×11≡0mod11.
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| Part | Test | Passed? |
|---|---|---|
| Information only | ||
| Number entry | ||
| Hasn't run yet |
This question is used in the following exam: