0 like 0 dislike
8.2k views

Write a function num_digits(n) that returns the number of digits in n ( a positive integer). Hint: to determine the number of digits in a number n, divide it by 10 repeatedly. when n reaches 0, the number of divisions indicates how many digits n originally had.

寫一個num_digits(n)函數 計算n有幾位數

#include <stdio.h>
int num_digits(int n)
{
   /*INSERT YOUR CODE HERE*/

   /*在這裡寫你的程式*/
   /*END OF YOUR CODE*/
}

int main(void)
{
   int n;
   scanf("%d", &n);
   printf("%d has %d digit(s)",n,num_digits(n));
   return 0;
}

Please complete this program by only insert your code between those tags:

   /*INSERT YOUR CODE HERE*/ 
   /*END OF YOUR CODE*/

Example input

12347

Example output

12347 has 5 digit(s)

Remember: You may correct the cases, but your code always be revised!

[Exercise] Coding (C) - asked in Chapter 9: Functions by (5.2k points)
ID: 35784 - Available when: 2017-12-07 18:00 - Due to: Unlimited

edited by | 8.2k views

45 Answers

0 like 0 dislike
Hidden content!
#include <stdio.h>
int num_digits(int n)
{
**** **** ***** * * **** * count=0;
* * * * * * * *** * != 0)
** ** * * *** * ** **
***** ******* ** ** *** *** * * **** * ** *
* * * **** *** ** * ** * * *** * *** /= 10;
* *** * * * *** * **
* * * **** * * * ***** ** count;
}

int main(void)
{
* * ** **** * * ** * * ** * * n;
** * * *** ** **** * * &n);
* * * ** * * * *** * ** * ****** has %d ** ** * * * * ***
** * *** *** * ** ** *** ** 0;
}
answered by (-140 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 <stdio.h>
int num_digits(int n)
{
** * * * * **** i;
* * **** ** * ******* * *******
** ** ** *
**** ** * *** * ** *** *** * * *** * * **
** ** *** * * ****
****** *** ** * ** * ** i;
}

int main(void)
{
* ** *** *** * ** n;
* *** ***** * ** ****** * * * &n);
* * **** ** ** **** ** * has %d * * *** * **
* * * * * * * **** 0;
}
answered by (-66 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 ****** **** ** *
#include * ******* **
int num_digits(int n)
{
*** ***** *** *
****** ** **** * **** *** 1;
* ** * * **
** ***** * **** ** *** ***
*** *** * * **** * *** ** * ***
}



int main(void)
{
****** ** * * n;
* * * * **** * * *** *** *** * ** &n);
** * * * * **** * * * has %d ** *** ** *
* ***** ** *** * * 0;
}
answered by (16 points)
0 0
prog.c: In function 'num_digits':
prog.c:8:6: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
    n=abs(n);
      ^~~
0 like 0 dislike
Hidden content!
#include *** *** *
#include * * ** ** *** ***
int is_prime(int n)
{
********** **** ** * divisor;
if (n<=1)
***** * ** false;
for (divisor ** * *** * *******
* **** ** ** *
return true;
}
int main(void)
{
*** * * ** *** n;
* * * ** * * * * * ** ** * * * *** &n);
*** * * * ** * ***** (is_prime(n)) *** ** * * *** *** * ** * ** **** * **** *** * function return 1
* * * ** * * * * ** ***** *** ** * ** * ** *
* *** * *** * * ** *** * * * * ** * * *** * * *** * *** * *** * *** * ** * ******* * * * *** *** ** ** * **** * *** ******* * * function return 0
* **** ******* *** * * * * * * ** * ****** * * * * **
** ** ** * * * * 0;
}
answered by (16 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 num_digits(int n)
{
* *** * *** * *******
**** * * * **** 1;
* ****** * * *
**** ******* * ***
******** **** * ***** *** **
}

int main(void)
{
** *** ** ** *** n;
* * * * **** ** * ** * ****** &n);
*** * * * * ** ** has %d * ** * * * * * ** *
******* **** *** * ** *** 0;
}
answered by (16 points)
0 0
prog.c: In function 'num_digits':
prog.c:7:6: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
    n=abs(n);
      ^~~
prog.c:8:16: warning: implicit declaration of function 'log10' [-Wimplicit-function-declaration]
    return (int)log10(n)+1;
                ^~~~~
prog.c:8:16: warning: incompatible implicit declaration of built-in function 'log10'
prog.c:8:16: note: include '<math.h>' or provide a declaration of 'log10'
0 like 0 dislike
Hidden content!
#include <stdio.h>
int num_digits(int n)
{
**** * * * * *** count=0;
* ***** *** * * *** * != 0)
* *** **** * **** ******
** * * * *** * ** ** ** ** ****** ***** * ****
* * ** * ** * *** ****** * ******* * /= 10;
** ** * *****
* ***** * **** *** ** * ****** count;
}

int main(void)
{
**** * *** * * * *** n;
* * * ** * *** * *** *** ** ** * *** &n);
** * ** * * *** * * ** ** * ***** has %d * * *** * * * * **
* **** ** ** ** 0;
}
answered by (-168 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 <stdio.h>
int num_digits(int n)
{
****** * * * * ** ** cnt=0;
*** * * * *** ******* *** != 0)
* * **** * ***** ** **
***** ***** * * **** *** **** *** *** /= 10;
* * * *** * * ** ***** *** ** *** * *
** * ** * ** ***
** ** **** ** * ** ** cnt;
** ** ** ** **** * * **

int main(void)
{
* ***** * * * **** ** * n;
* *** * * * ** ****** ** * * ** &n);
* * ** * *** * * * has %d * * * * ** **
** * * * **** * * **** 0;
}
answered by (323 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 <stdio.h>
int num_digits(int n)
{
*** **** ** *** ***** * count=0;
* * * ** *** *
** *** ** * ** * ******** ** * * != 0)
** ****** ***** **
* **** ** * ** * ** * * * ** **** **
** * * ******* *** ** **** ** * * ** * **** ++;
* * **** **** * * * *
* *** **** *** ** **
** *** **** * ** * * * count;
}
int main(void)
{
* * * * ****** * * ** ** n;
***** ** * * ** * ** * *** * * * * ** &n);
* * *** **** * * *** ** ** * ** has %d ** ** ** * * *****
** ** ***** * ** * * * 0;
}
answered by (-193 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!
int num_digits(int n)
{
** ** * ** * ** num_digit=0;/*INSERT YOUR CODE HERE*/
* ***** * **** * *
* *** ** * **
* * * ** * * * **** * * * ** *** ** * **
*** *** * * * *** ** *** ** * **
* ******* * *** *

***** * *** **** *** * ** ** * * *
****** * ** **** OF YOUR CODE*/
* *** ** **** * * * num_digit;
}

int main(void)
{
** * * * * * * * ** n;
** *** ** **** * ***** ** * * * &n);
*** ** * * ** * ** has %d * * * **** * * * * *
*** ** **** * ** * ** 0;
}
answered by (-167 points)
0 0
prog.c: In function 'main':
prog.c:18:4: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    scanf("%d", &n);
    ^~~~~
prog.c:18:4: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:18:4: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:19:4: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    printf("%d has %d digit(s)",n,num_digits(n));
    ^~~~~~
prog.c:19:4: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:19:4: note: include '<stdio.h>' or provide a declaration of 'printf'
0 like 0 dislike
Hidden content!
int num_digits(int n)
{
* * * ** * * ** * count=0;/*INSERT YOUR CODE HERE*/
* ** * * * *** ** *****
** ****** * * * * ** *
**** ** ** *** * **** * **** * * ******* ***
******** * * * * * ** * ** ** ***
* * * *** * ***

** ** ** * ** * * * * *
** * * * ***** * OF YOUR CODE*/
* * * * * * * * *** count;
}

int main(void)
{
* ** * * * * n;
** ** *** **** *** *** * ****** &n);
*** * * ** * * **** * * has %d *** *** *** * *** ****
**** ** ** * * ** 0;
}
answered by (-167 points)
0 0
prog.c: In function 'main':
prog.c:18:4: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    scanf("%d", &n);
    ^~~~~
prog.c:18:4: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:18:4: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:19:4: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    printf("%d has %d digit(s)",n,num_digits(n));
    ^~~~~~
prog.c:19:4: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:19:4: note: include '<stdio.h>' or provide a declaration of 'printf'
Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.71.255.49
©2016-2025

Related questions

0 like 0 dislike
47 answers
[Exercise] Coding (C) - asked Dec 7, 2017 in Chapter 9: Functions by semicolon (5.2k points)
ID: 35785 - Available when: 2017-12-07 18:00 - Due to: Unlimited
| 7.9k views
0 like 0 dislike
79 answers
[Exercise] Coding (C) - asked Dec 28, 2017 in Chapter 9: Functions
ID: 39986 - Available when: Unlimited - Due to: Unlimited
| 15.9k views
0 like 0 dislike
70 answers
[Exercise] Coding (C) - asked Dec 7, 2017 in Chapter 9: Functions by semicolon (5.2k points)
ID: 35783 - Available when: 2017-12-07 18:00 - Due to: Unlimited
| 12k views
0 like 0 dislike
50 answers
[Exercise] Coding (C) - asked Dec 13, 2017 in Chapter 9: Functions by semicolon (5.2k points)
ID: 37278 - Available when: 2017-12-14 18:00 - Due to: Unlimited
| 10.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users