0 like 0 dislike

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 (11.3k points)
Available when: 2017-11-15 14:10 - Due to: Unlimited
| 43 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);
                               ^
Get it on Google Play Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.69.62.64
©2016-2019

Related questions

1 like 1 dislike
49 answers
[Exam] asked Nov 15, 2017 in Midterm by thopd (11.3k points)
Available when: 2017-11-15 14:10 - Due to: Unlimited
| 52 views
2 like 0 dislike
77 answers
[Exercise] Coding (C) - asked Oct 19, 2017 in Chapter 5: Selection Statements by thopd (11.3k points)
Available when: Unlimited - Due to: Unlimited
| 215 views
0 like 0 dislike
15 answers
[Exam] asked Dec 9, 2017 in Midterm by thopd (11.3k points)
Available when: 2017-11-15 14:10 - Due to: Unlimited
| 42 views
9,098 questions
79,704 answers
53,991 comments
2,452 users