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