0 like 0 dislike
5.7k views

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

 

[Exam] asked in Midterm by (12.1k points)
ID: 36751 - Available when: 2017-11-15 14:10 - Due to: Unlimited
| 5.7k views

26 Answers

0 like 0 dislike
Hidden content!
#include<stdio.h>

int main(){
    char isbn[12];
    int a,b,c,d,e,f,g,i=0,j;
** ** ** * ** * * ** ***** * **** ** * **** *
* * * **** * ***** * *** ****
* * * * * * *** ** ** * ** ****** * * * * ** ***
* ***** * * * ** *** * * ** ** **
** *** ***** * * * * **** * ***** * * * *
** **** ** ** ** * **
* * ** ***** * * * * ****
* *** * ** *** * * ****
**** * *** ** * **** *** * *
* **** ** *** ** * * **
* * ** ***** ** ***** *** ** * ** * ***** * * ** * *** * * * ISBN");
* ** * * * ** ** *
* * * * ** ** * **** * ** *** **** * * * *** * * ** ISBN");

}
answered by (-32 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
0 like 0 dislike
Hidden content!
#include<stdio.h>

int main(){
    char isbn[12];
    int a,b,c,d,e,f,g,i=0,j;
** * * * * * * ** * * ** * * * *** * **
* ** * *** ** *** * ***** **** *
** ** * * * * ** * * ** *** *** * ** * ***** * *****
***** * ** *** ****** * * * *** * *
** *** *** ** ** * *** ****** ** *** ** * * ****
* ** ** *** * *** **
** * * *** ** ** * *
** *** ** ** *** * ****
* * ****** * * * * * *** **
** *** ** ***** **** * *** **
**** ** * * * * * * *** * *** * ** **** * ***** ** ISBN");
** * ** **** * * *
** * * * * * **** * * ** * *** ** ** * * **** **** ISBN");

}
answered by (-32 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
0 like 0 dislike
Hidden content!
#include <stdio.h>
#include <string.h>

int main(){
    ///long long int n = 978960931962;

    long long int n;// = 9789609319614;
    int lastDigit;
    int temp1;
    int sum=0;
    int check=0;

*** ***** * * ** * ** * * *** ** * *** ** ***

*** * * * * ***** *** * * *** = n%10;
******* ** * * ** ** * ***** *** ** * * *** = n/10;

* * * * * * * * * * * *** ** * * * = n%10;
** * * *** ****** * * * * * * *** * * * * = temp1*3;
**** ** * * ** *** ** ** ** * **** *** * * * = sum + temp1;
**** * ** *** **** * * * * ** *** * ** * ** ** *** ** ** ", temp1);
* *** * * * ** ** *** * * ******** *** *** * ** ** = n/10;


* * ** * * ** * * * * *** *** ** **** **** ** *** = n%10;
* * * * ***** * * ** * ** **** * * ** ** ***** ** * = temp1*1;
***** * * * * * ** * * * ** ** * ** **** * * = sum + temp1;
* ** * * * ***** ** ** * * * * *** * *** ", temp1);
** * * ** *** * ** * * * ** * * **** * * = n/10;

* * * * *** * * **** * ** * ** *** ***** **** = n%10;
** * *********** *** ***** ** ***** *** * *** = temp1*3;
* * * * *** * * * ** ***** *** * = sum + temp1;
*** ** * * * ** * ********* * * * * ** ****** * ", temp1);
* ** ** ** * **** * ** * ****** * * * * * = n/10;

** * *** * ** ** * ** *** * *** * ** = n%10;
* * **** *** **** * * ******** ** ** * *** * **** ** * = temp1*1;
**** * *** *** **** ** ** * *** ****** ***** * ** = sum + temp1;
** ** ** * * *** * * ***** * * *** * * * ** ", temp1);
** *** * * * * * ** ** * * * = n/10;

* ***** * * * ** *** ** * * * ****** * * ***** * ** = n%10;
*** ** ** *** * * *** * **** * * *** * * * = temp1*3;
* * * ** * * * * * *** * * ** ** *** * * = sum + temp1;
* ** ** **** ** ** ** * ******* * *** **** * ", temp1);
* * ** ** ***** * * * * **** ** *** = n/10;

** **** * * ******** *** * * * * * *** * * * ** = n%10;
* **** * * * ** ***** * ** ** ** * *** *** **** * = temp1*1;
* ****** * ***** * *** ****** *** * **** = sum + temp1;
* ** *** ** * * *** * * **** ****** ** *** * * ", temp1);
** *** ** * * * * * ** * ** ** * * ** = n/10;

**** * * ***** * **** *** * * * ** * ** ** * = n%10;
****** ** ** * * * ** ****** * ** * * * * = temp1*3;
** * **** **** ** * *** * * * *** * * ** ** * * ** * = sum + temp1;
*** ** ** ** *** ** **** ***** ** ** *** * *** * * ** ", temp1);
** * **** * ******** * *** *** *** ****** *** = n/10;

* ** ** * *** ****** **** * ** *** *** * * ** = n%10;
* * * * **** ** *** ** *** * ***** ** ** * = temp1*1;
* ********* ** ***** ** ** ** **** * * *** *** = sum + temp1;
* *** ***** * ** *** ** * *** *** *** **** * ** **** ", temp1);
* ** * * **** * *** ** * * * **** * * *** * * = n/10;

* ** ** *** **** ** * **** ** *** * = n%10;
* ** ** **** * * * * *** * * * * *** = temp1*3;
* * ** * * * ** ***** * * **** ** *** ***** * = sum + temp1;
** ****** * * **** ** **** * * * * * * *** *** ** ** ** * ", temp1);
*** ** * * * ******* *** *** * * * * ** * * * = n/10;

** *** ****** ** ** ** ** ** * ** ** * * = n%10;
*** * ** * *** * **** ** *** * ** *** = temp1*1;
* *** ***** ** **** *** * *** ** * **** ** * = sum + temp1;
* ** * * ******** * *** * * * **** ** ** **** * ** ", temp1);
** * * * * ** * * **** * * * *** *** = n/10;

* *** * * **** * *** ** ***** *** ** *** * * *** = n%10;
***** * ***** ** ** *** ** ** *** ** ** ** = temp1*3;
* ***** **** ** ** * * * ** * ** *** *** * = sum + temp1;
* * * * * *** * * * * * ** * ***** *** ** **** ", temp1);
**** * * ***** * * * ** * ** * * = n/10;

** *** **** ** * * * * * ** * * *** *** ** = n%10;
* *** ******* * ****** ** ***** * ** ** * **** = temp1*1;
**** ** *** *** * * ** * ** ** *** * = sum + temp1;
* * **** * ** * * * ** * ** ** *** *** * *** ", temp1);

****** ** * ** ** ** ** * * ** * * * * *** **** * ",sum);
* * **** *** **** **** * ** * * * ** * = 10 - (sum%10);


* ****** ***** *** * ** *** ** * * * **** * ** ** ** == check)
** *** * * * ******* ** * **** * * ***** * * ** ** **** ****** *** *** * ISBN\n");
*** * * ** * *** * **** * * ** *****
** * * * * * * * * *** * * * * * * ** * * *** ** * **** ** * * ** * ISBN\n");

    return 0;
}
90/100 answered by (-74 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
0 like 0 dislike
Hidden content!
#include * * **** *


int main (void)
{

int ** **** ** * ** * * ** * * * * ** **

*** * * *** *** * ** **** * ** ** * * * ****** *** * ** ** ** * * * *** * * ** **** ***** ***** * ** **** ***** * ** * * * * ** * *



total= * * ******** *** * *** * * ***** ** ** * * ****** **** * * * *

check_digit= (10-(total%10));

 if (check_digit!=num13)
*** * * ** * ** *

* ** *** * * * ** * * ** ** * ISBN");

** * * * * *** ** * *

** * * * *** * * * * * if *** ** **
** ****** **** ** * *** ** ** ** ***** *


* * * ***** **** * * **** ** *** * * * * * * * *** *** *** ISBN");

}

return 0;
}
answered by (-107 points)
0 0
prog.c: In function 'main':
prog.c:9:7: warning: too many arguments for format [-Wformat-extra-args]
 scanf("%13d",&num1,&num2,&num3,&num4,&num5,&num6,&num7,&num8,&num9,&num10,&num11,&num12,&num13);
       ^~~~~~
0 like 0 dislike
Hidden content!
#include ** * ** **


int main (void)
{

int *** ** ** ** * ** ** ** * * * ***

**** ** ** ** * * * * * * ***** *** **** ** * * **** * ** * *** *** * * * * * * *** * ** ** *** *



total= * * *** * *** **** * ** *** * ** ***** ** ** * ****

check_digit= (10-(total%10));

 if ** **** * *
** **** ** ** *

* * ** ** *** **** * * * ISBN");

}

** * * *** ***** * * ** if ******* * * **
* ** **** *** **** * **** *** * ** ** ****


** * * * * *** ** * **** * * * * * * ** * ** ** ****** ISBN");

}

return 0;
}
answered by (-107 points)
0 0
prog.c: In function 'main':
prog.c:9:7: warning: too many arguments for format [-Wformat-extra-args]
 scanf("%13d",&num1,&num2,&num3,&num4,&num5,&num6,&num7,&num8,&num9,&num10,&num11,&num12,&num13);
       ^~~~~~
0 like 0 dislike
Hidden content!
#include<stdio.h>
int main()
{
** * **** *** * **** * a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, sum1,sum2, sum3, check;
*** ** ** * * ** * * * *** ** ** **** * *** * *** * *** * ****** ** *** ** **** ** * ** * * * * **** * *** * ** *** * ** **

**** * *** ** ** * * ********** * *
** ** ** ** ** * * * * **** ** ****

** * ** ** * * ** * * * sum1+sum2;

** ** * ** * *** * * * * 10 - (sum3%10);

* ** * * * ******* * * * **
** * ** *** *** * ***
** * *** **** ******** ** * * ** ** *** * *** * ***** * ISBN");
** * *** * * * * * * **
*** * ******** ** *
**** *** ** *** * *** *
** * ** ***** ** ** ** ** **** * * ** ** * * * * IBSN");
* * * ** * * ** *** *
* * *** * **** * * * *** ** 0;
}
answered by (-233 points)
0 0
prog.c: In function 'main':
prog.c:5:14: warning: format '%ld' expects argument of type 'long int *', but argument 2 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
              ^
prog.c:5:17: warning: format '%ld' expects argument of type 'long int *', but argument 3 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                 ^
prog.c:5:20: warning: format '%ld' expects argument of type 'long int *', but argument 4 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                    ^
prog.c:5:23: warning: format '%ld' expects argument of type 'long int *', but argument 5 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                       ^
prog.c:5:26: warning: format '%ld' expects argument of type 'long int *', but argument 6 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                          ^
prog.c:5:29: warning: format '%ld' expects argument of type 'long int *', but argument 7 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                             ^
prog.c:5:32: warning: format '%ld' expects argument of type 'long int *', but argument 8 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                                ^
prog.c:5:35: warning: format '%ld' expects argument of type 'long int *', but argument 9 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                                   ^
prog.c:5:38: warning: format '%ld' expects argument of type 'long int *', but argument 10 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                                      ^
prog.c:5:41: warning: format '%ld' expects argument of type 'long int *', but argument 11 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                                         ^
prog.c:5:44: warning: format '%ld' expects argument of type 'long int *', but argument 12 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                                            ^
prog.c:5:47: warning: format '%ld' expects argument of type 'long int *', but argument 13 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                                               ^
prog.c:5:50: warning: format '%ld' expects argument of type 'long int *', but argument 14 has type 'int *' [-Wformat=]
     scanf("%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld%ld", &a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);
                                                  ^
0 like 0 dislike
Hidden content!
#include * * * * *


int main (void)
{

int * * ******** * *** * * ** * * *****

* ***** *** * ******** ******* * ** ** * * ** * * ***** ** **** ** ** * * * *** ** **** * * * * *** * *** **



total= ****** * ** * * * ***** * * ****** **** *** ****** *** * * * * * *
check_digit= 10-(total%10);

 if ** **
* *** ***** **

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

 else if ***** *
* ** * *** ** * **

*** *** * * *** ** ** * * * **** * ** * ***** ** ** ******** ** * * *** * *

 }

return 0;
}
answered by (-107 points)
0 0
prog.c: In function 'main':
prog.c:9:7: warning: too many arguments for format [-Wformat-extra-args]
 scanf("%13d",&num1,&num2,&num3,&num4,&num5,&num6,&num7,&num8,&num9,&num10,&num11,&num12,&num13);
       ^~~~~~
0 like 0 dislike
Hidden content!
#include ** ** * * *


int main (void){

int **** ** ** ** * * * * * * *** ** * *

* ******* ** ** ***** * * *** ** * ** * ** * ***



total= **** *** ** ****** * * * *** *** ** *** * * ** ** * *
check_digit= 10-(total%10);

 if * *****
* * * * ** ** * * * ***


***** * * ** *** *** ****** * **** ** * * *
}
 
* if *** *** *
* * * *** *** * ** *

* ** * * **** * *** ** *** * ** * ***** * * * * ** ** *

 }

return 0;
}
answered by (-107 points)
0 0
prog.c: In function 'main':
prog.c:8:11: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
 scanf("%13d",num1,num2,num3,num4,num5,num6,num7,num8,num9,num10,num11,num12,num13);
           ^
prog.c:8:7: warning: too many arguments for format [-Wformat-extra-args]
 scanf("%13d",num1,num2,num3,num4,num5,num6,num7,num8,num9,num10,num11,num12,num13);
       ^~~~~~
0 like 0 dislike
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");
    }

return 0;
}
answered by (-249 points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
0 like 0 dislike
Hidden content!
#include * ***** *
int main (){
int ** ** * ** * **
int * **** ***
* ** * * ** * number 13: ");
*** * ** * ***** ** * *** * * ******* *** * * *
* *** **** * ** * * * * * *** ****
* * **** * * * * * ** **
* ***
*** ** *
* ***
* * ***** * * ** *
}else {
* ** * ** * ** ** *****
}

return 0;
}
answered by (16 points)
0 0
prog.c: In function 'main':
prog.c:6:9: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
         ^
prog.c:6:11: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
           ^
prog.c:6:13: warning: format '%d' expects argument of type 'int *', but argument 4 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
             ^
prog.c:6:15: warning: format '%d' expects argument of type 'int *', but argument 5 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
               ^
prog.c:6:17: warning: format '%d' expects argument of type 'int *', but argument 6 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
                 ^
prog.c:6:19: warning: format '%d' expects argument of type 'int *', but argument 7 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
                   ^
prog.c:6:21: warning: format '%d' expects argument of type 'int *', but argument 8 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
                     ^
prog.c:6:23: warning: format '%d' expects argument of type 'int *', but argument 9 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
                       ^
prog.c:6:25: warning: format '%d' expects argument of type 'int *', but argument 10 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
                         ^
prog.c:6:27: warning: format '%d' expects argument of type 'int *', but argument 11 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
                           ^
prog.c:6:29: warning: format '%d' expects argument of type 'int *', but argument 12 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
                             ^
prog.c:6:31: warning: format '%d' expects argument of type 'int *', but argument 13 has type 'int' [-Wformat=]
 scanf("%d%d%d%d%d%d%d%d%d%d%d%d",i1,i2,i3,i4,i5,i6,i7,i8,i9,i10,i11,i12);
                               ^
Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.70.100.182
©2016-2025

Related questions

1 like 1 dislike
49 answers
[Exam] asked Nov 15, 2017 in Midterm by thopd (12.1k points)
ID: 32706 - Available when: 2017-11-15 14:10 - Due to: Unlimited
| 8.7k views
2 like 0 dislike
77 answers
[Exercise] Coding (C) - asked Oct 19, 2017 in Chapter 5: Selection Statements by thopd (12.1k points)
ID: 27667 - Available when: Unlimited - Due to: Unlimited
| 14k views
0 like 0 dislike
15 answers
[Exam] asked Dec 9, 2017 in Midterm by thopd (12.1k points)
ID: 36755 - Available when: 2017-11-15 14:10 - Due to: Unlimited
| 4.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users