0 like 0 dislike
5.2k 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
| 5.2k 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:172.71.1.182
©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
| 8.1k 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
| 13.5k 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
| 3.8k views
12,783 questions
183,442 answers
172,219 comments
4,824 users