0 like 0 dislike
4k 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
| 4k 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:172.69.58.4
©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
| 6.2k 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
| 10.4k 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
| 3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users