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The 13-digit International Standard Book Number (ISBN) is a unique code that identifies a book commercially. The last digit is a check digit used for error detection. To calculate its value, each digit of the first twelve digits is alternately multiplied, from left to right, by 1 or 3. The products are summed up and divided by 10. The check digit is the remainder of the division subtracted from 10. If it is 10, it becomes 0. 

ISBN檢查號的計算方法: 前12個數字,奇數項 乘以 1 , 偶數項乘以 3

For example, assume that the first twelve digits are 978960931961.  

假設號碼前12位是978960931961

(a) (9*1 + 7*3 + 8*1 + 9*3 + 6*1 + 0*3 + 9*1 + 3*3 + 1*1 + 9*3 + 6*1 + 1*3) = 126 

(b) The check digit = 10 – (126 % 10) = 10 – 6 = 4  

檢查號 = 10 - 餘數 = 10 – (126 % 10) = 10 – 6 = 4  

So the valid ISBN is: 9789609319614

Write a program that reads a 13-digit ISBN and checks the last digit to see if it is valid or not. 

寫一個輸入13位ISBN號碼 判斷最後一個數字是否檢查碼即可

#Try 1:

Input:

9789609319614

Output: 

Valid ISBN

 

#Try 2:

Input:

9781482214505

Output: 

Valid ISBN

 

#Try 3:

Input:

9780132936493

Output: 

Invalid ISBN

 

[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (12.1k points)
ID: 27667 - Available when: Unlimited - Due to: Unlimited

edited by | 14k views

77 Answers

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Hidden content!
#include <stdio.h>

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answered by (323 points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
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Hidden content!
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answered by (-193 points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
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answered by (-249 points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
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answered by (-249 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
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Hidden content!
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answered by (-249 points)
0 0
prog.c: In function 'main':
prog.c:12:18: error: stray '\302' in program
  if (check==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                  ^
prog.c:12:19: error: stray '\240' in program
  if (check==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                   ^
prog.c:12:20: error: stray '\302' in program
  if (check==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                    ^
prog.c:12:21: error: stray '\240' in program
  if (check==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                     ^
prog.c:12:22: error: stray '\302' in program
  if (check==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                      ^
prog.c:12:23: error: stray '\240' in program
  if (check==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                       ^
prog.c:14:1: error: stray '\302' in program
 \xc2\xa0 \xc2\xa0 printf("Valid ISBN");
 ^
prog.c:14:2: error: stray '\240' in program
 \xc2\xa0 \xc2\xa0 printf("Valid ISBN");
  ^
prog.c:14:4: error: stray '\302' in program
 \xc2\xa0 \xc2\xa0 printf("Valid ISBN");
    ^
prog.c:14:5: error: stray '\240' in program
 \xc2\xa0 \xc2\xa0 printf("Valid ISBN");
     ^
prog.c:15:2: error: stray '\302' in program
  \xc2\xa0}
  ^
prog.c:15:3: error: stray '\240' in program
  \xc2\xa0}
   ^
prog.c:16:7: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
       ^
prog.c:16:8: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
        ^
prog.c:16:9: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
         ^
prog.c:16:10: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
          ^
prog.c:16:11: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
           ^
prog.c:16:12: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
            ^
prog.c:16:13: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
             ^
prog.c:16:14: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
              ^
prog.c:18:2: error: stray '\302' in program
  \xc2\xa0 \xc2\xa0printf("Invalid ISBN");
  ^
prog.c:18:3: error: stray '\240' in program
  \xc2\xa0 \xc2\xa0printf("Invalid ISBN");
   ^
prog.c:18:5: error: stray '\302' in program
  \xc2\xa0 \xc2\xa0printf("Invalid ISBN");
     ^
prog.c:18:6: error: stray '\240' in program
  \xc2\xa0 \xc2\xa0printf("Invalid ISBN");
      ^
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Hidden content!
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{
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answered by (-249 points)
0 0
prog.c: In function 'main':
prog.c:12:18: error: stray '\302' in program
 if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                  ^
prog.c:12:19: error: stray '\240' in program
 if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                   ^
prog.c:12:20: error: stray '\302' in program
 if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                    ^
prog.c:12:21: error: stray '\240' in program
 if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                     ^
prog.c:12:22: error: stray '\302' in program
 if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                      ^
prog.c:12:23: error: stray '\240' in program
 if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                       ^
prog.c:13:1: error: stray '\302' in program
 \xc2\xa0{printf("Valid ISBN\n");}
 ^
prog.c:13:2: error: stray '\240' in program
 \xc2\xa0{printf("Valid ISBN\n");}
  ^
prog.c:15:7: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0{printf("Invalid ISBN\n");}
       ^
prog.c:15:8: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0{printf("Invalid ISBN\n");}
        ^
prog.c:15:9: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0{printf("Invalid ISBN\n");}
         ^
prog.c:15:10: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0{printf("Invalid ISBN\n");}
          ^
prog.c:15:11: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0{printf("Invalid ISBN\n");}
           ^
prog.c:15:12: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0{printf("Invalid ISBN\n");}
            ^
prog.c:15:13: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0{printf("Invalid ISBN\n");}
             ^
prog.c:15:14: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0{printf("Invalid ISBN\n");}
              ^
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Hidden content!
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answered by (-249 points)
0 0
prog.c: In function 'main':
prog.c:13:19: error: stray '\302' in program
  if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                   ^
prog.c:13:20: error: stray '\240' in program
  if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                    ^
prog.c:13:21: error: stray '\302' in program
  if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                     ^
prog.c:13:22: error: stray '\240' in program
  if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                      ^
prog.c:13:23: error: stray '\302' in program
  if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                       ^
prog.c:13:24: error: stray '\240' in program
  if (dcheck==d13) \xc2\xa0\xc2\xa0\xc2\xa0
                        ^
prog.c:14:1: error: stray '\302' in program
 \xc2\xa0printf("Valid ISBN\n");
 ^
prog.c:14:2: error: stray '\240' in program
 \xc2\xa0printf("Valid ISBN\n");
  ^
prog.c:16:7: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
       ^
prog.c:16:8: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
        ^
prog.c:16:9: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
         ^
prog.c:16:10: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
          ^
prog.c:16:11: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
           ^
prog.c:16:12: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
            ^
prog.c:16:13: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
             ^
prog.c:16:14: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0
              ^
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Hidden content!
* * * * * ******
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{
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answered by (-249 points)
0 0
prog.c: In function 'main':
prog.c:12:20: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                    ^
prog.c:12:21: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                     ^
prog.c:12:22: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                      ^
prog.c:12:23: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                       ^
prog.c:12:24: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                        ^
prog.c:12:25: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                         ^
prog.c:13:1: error: stray '\302' in program
 \xc2\xa0printf("Valid ISBN\n");
 ^
prog.c:13:2: error: stray '\240' in program
 \xc2\xa0printf("Valid ISBN\n");
  ^
prog.c:15:7: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
       ^
prog.c:15:8: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
        ^
prog.c:15:9: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
         ^
prog.c:15:10: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
          ^
prog.c:15:11: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
           ^
prog.c:15:12: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
            ^
prog.c:15:13: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
             ^
prog.c:15:14: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
              ^
prog.c:15:2: error: this 'else' clause does not guard... [-Werror=misleading-indentation]
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
  ^~~~
prog.c:15:41: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
                                         ^~~~~~
prog.c:15:2: error: expected declaration or statement at end of input
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
  ^~~~
cc1: all warnings being treated as errors
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Hidden content!
** ** ** * ** * * * *
int main (void)
{
int * ********* ** **** ** * * * ***** ** ** * * * * * ** * **** * ***** * ** *** * * ** * **** * ** ** * * * * * ** * * *** **

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** * * * * ** *** ** 0;
answered by (-249 points)
0 0
prog.c: In function 'main':
prog.c:12:20: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                    ^
prog.c:12:21: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                     ^
prog.c:12:22: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                      ^
prog.c:12:23: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                       ^
prog.c:12:24: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                        ^
prog.c:12:25: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                         ^
prog.c:13:1: error: stray '\302' in program
 \xc2\xa0printf("Valid ISBN\n");
 ^
prog.c:13:2: error: stray '\240' in program
 \xc2\xa0printf("Valid ISBN\n");
  ^
prog.c:15:7: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
       ^
prog.c:15:8: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
        ^
prog.c:15:9: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
         ^
prog.c:15:10: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
          ^
prog.c:15:11: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
           ^
prog.c:15:12: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
            ^
prog.c:15:13: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
             ^
prog.c:15:14: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
              ^
prog.c:15:2: error: this 'else' clause does not guard... [-Werror=misleading-indentation]
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
  ^~~~
prog.c:15:41: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
                                         ^~~~~~
prog.c:15:2: error: expected declaration or statement at end of input
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
  ^~~~
cc1: all warnings being treated as errors
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Hidden content!
* * ** *
int main * **
{
int ** * *** * * ***** ** * * ** **** ******* * * * * * * *** ** * ***** * ** * * ** * ** * * ** **** * * *** * * * * * ** ** *

* ** **** * + *** + ** + (d4*3) + (d5*1) + (d6*3) + ** + * * + ** + *** + ** + ***

*** ** ***

if ** ** == 10) *** ** * = 0;

if * * == d13) *
** * * ** ** ** ** * *

*** *** * *** * * * ** * * * return 0;
answered by (-249 points)
0 0
prog.c: In function 'main':
prog.c:10:19: error: stray '\302' in program
 if (dcheck == 10) \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0dcheck = 0;
                   ^
prog.c:10:20: error: stray '\240' in program
 if (dcheck == 10) \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0dcheck = 0;
                    ^
prog.c:10:21: error: stray '\302' in program
 if (dcheck == 10) \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0dcheck = 0;
                     ^
prog.c:10:22: error: stray '\240' in program
 if (dcheck == 10) \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0dcheck = 0;
                      ^
prog.c:10:23: error: stray '\302' in program
 if (dcheck == 10) \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0dcheck = 0;
                       ^
prog.c:10:24: error: stray '\240' in program
 if (dcheck == 10) \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0dcheck = 0;
                        ^
prog.c:10:25: error: stray '\302' in program
 if (dcheck == 10) \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0dcheck = 0;
                         ^
prog.c:10:26: error: stray '\240' in program
 if (dcheck == 10) \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0dcheck = 0;
                          ^
prog.c:12:20: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                    ^
prog.c:12:21: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                     ^
prog.c:12:22: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                      ^
prog.c:12:23: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                       ^
prog.c:12:24: error: stray '\302' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                        ^
prog.c:12:25: error: stray '\240' in program
 if (dcheck == d13) \xc2\xa0\xc2\xa0\xc2\xa0
                         ^
prog.c:13:1: error: stray '\302' in program
 \xc2\xa0printf("Valid ISBN\n");
 ^
prog.c:13:2: error: stray '\240' in program
 \xc2\xa0printf("Valid ISBN\n");
  ^
prog.c:15:7: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
       ^
prog.c:15:8: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
        ^
prog.c:15:9: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
         ^
prog.c:15:10: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
          ^
prog.c:15:11: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
           ^
prog.c:15:12: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
            ^
prog.c:15:13: error: stray '\302' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
             ^
prog.c:15:14: error: stray '\240' in program
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
              ^
prog.c:15:2: error: this 'else' clause does not guard... [-Werror=misleading-indentation]
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
  ^~~~
prog.c:15:41: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
                                         ^~~~~~
prog.c:15:2: error: expected declaration or statement at end of input
  else \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0printf("Invalid ISBN\n"); return 0;
  ^~~~
cc1: all warnings being treated as errors
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