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