Midterm Question 2 - Makeup

Question

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

 

Answer 1

Hidden content!
#include<stdio.h>
int main(void)
{
  ** *       **    * ** **** a,b,c,d,e,f,g,h,i,j,k,l,m;
***     * *** * ** **** **  *  *** **** *  *   **  * *   *   *    **   *  **  ** **  **** *   **   ** *  *** *    ***    *    **** *   *   *  *  *  *   * * *   * * 

   * *  *    *   *   *    check,sum;
   ****     **   *  ***  *** ** * **  *  *     * ***
 *  ** * *** * ** ** **       ****
    

**    * * *  *  *   * **     *** 
* **  * * ** *  ** *  *  *  *
*** *** ***   **  * ****** *** **    * *** ***     ****  ** 
    }

   * *** * **   ** ** * *   * * *  if(check != m)
*    ** *           *  ***** *
 *** **   ** * **  *  *** *  *  ******   *   * ***    *     * ** *** ** ISBN");
 * * ***    *    ***  *  
**** ***      *** * * ** *
 * ** *  * ***   *   ***     
*  **** ** ** ** *   *  **   *   ********       ** * ISBN");
*  *** *  ** ***     * *   
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Wrong output

Answer 2

Hidden content!
#include<stdio.h>
int main(void)
{
  * * *   **    * **  *      *   a,b,c,d,e,f,g,h,i,j,k,l,m;
**   * * *    *  *** ** ** ** *   * ** *   *   * ***  ** ** **   *  *** *    ** *   *   *  *  **  **  *    *** **  **  **  ** * * * *   **    * *  * **    **   *****  * ***  

   *  * *  *    ** ** ** *  *   check,sum;
   * *  *  *      * ***   * ***   *   ** 
** ***    * * **** *  * **  * *****   ** 
    


  *  * *** *  ** ***** **    * != m)
*  *   *** ****   *  *** 
       ** *        * **** ** *** *   * ** ** *  ****  *   *     * ****  **  ISBN");
 * *  *  * ***  **  ***   *
*  ** ***    **         
 ** ***     **   **** *   
  * *** *    ***   **** ** ** ****    *      **    * * ******* ISBN");
*   ******* ***      ** ******
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Wrong output

Answer 3

Hidden content!
*  *       ******* ** 
  *    * **   ****   *  **

int main()
{
* **  *   * **** * ** ***  *   ***** *    a noob.\nI forgot  *    *  *** ** * 
**    *  *  * * ** * *** *  ***  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output

Answer 4

Hidden content!
          *  ** *
int main()
{
int  *    **   ***  *   **  ****** * *****
*** *  ***      ***    *  ****   ****  *  *  * * *  ** **  *   ***    *  ** * ****** **     *  *  * * ***********   *    **    ****** * **  *  ** *** 
*    *  **   *  **** ** *** 
check=10-sum%10;
 *** * * *    * **    ****  ISBN");
else *   *   * *  *  *   ISBN");
return 0;
}

Comments

Case 0: Wrong output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 5

Hidden content!
#include<stdio.h>
int main()
{
 * * **** * *   ****   *  a[13],i,j;
 *  * ** ** *  **  ***   * *  **  * **  * 
*** *   ** **   *  ** ** * * **
    * **   **  * ** * **** * *  *   ***  * *  ** * * * **  * **** * ***  *   * 
    }
 **  *** *** *  * ****  **  ** ***    * * *** * **  * * *** **  * *   *
** ***   *    *  * ** *** * * *   *    ** 
    {
***     ******   **  **   * *  **  ***   ***** * **   *  ** *   ****     *   ISBN");
 *     *  ** * *** *   ** * 
    *****  *  *   * ****  *** * *
* * ** ** ***** *  *  **  
* * * *  *****  **   *** **  *  *  * * *  ** * ** *    ** *  ***    *  ISBN");
 **  ** *   * *  *** * *   *
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 6

Hidden content!
#include <stdio.h>
#include <stdlib.h>

int main()
{
*  * ***  ***    ****     *   *  * a,b,c,d,e,f,g,h,i,j,k,l,m,sum=0,check=0;
     * *   ****       *  ****      *  * * ** * *  * *   ** **   *****   * **  ** *** ***  * * ****     **** * ******** * **  *    *   * **    * ***   *** ****     ***** 
* ****  * *     *       *  ******* *      * *
** **    * **  ***       *  **

  *  * *** ****  *  *  **  ** (check==m)
*** *  ***    *     *  *     *** * **    ***     *   * ** ********* * ISBN");
**     *** * *   ** *  ****   
** **  * *   **  ** * *    ** ***   *** * * ** **    ** *********   ISBN");

   **** ***   * *     *  *   **** ** * 0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output