1-11 Exercise 3: Prefix of a string

0 like 0 dislike
14.8k views

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
ID: 41439 - Available when: Unlimited - Due to: Unlimited
edited by | 14.8k views
0 0
12345
commented by (-329 points)

27 Answers

0 like 0 dislike 
Hidden content!
#include *** ***   ** *   
#include **  *  * *    * 

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
 int count=0;
 
 *** **********  **   *** *
 
*****    *** ******* ** ***   *  ****   ** * ** ***   **
** *  *    ** *  * *  ** **  * * * * * 
 *  *       *** ****** **** * *** *    * ***  *** * *           == s2[i])
  * **       ** *   *  *** * **** * * ***** *  ** ** *** *
  ** **   *   ***    *  *  *  **      * *  **** *     *  * *  ** ** **  *** *  **   *
 * *** ** ****    *  **  * *** **  *  * **** 
 
 * *    ***   * **    ** **    ***
 
 ** *  **   *** * * **  * ** ***     * == length)
**   ****    * * * *  *  *   *** *   
   *   * *  * **  *  * *   *  *         ** **   * *** *     *  * ** *******  is a prefix of %s",s1,s2);
  *     * ***** ******  *  **   **   
 
 **   ****  ****** *** **  *** * 
*   *  *   *   *    *     *** *   **
* * *** * * *    ***   * ***  * *   *   *   * ** ****   ***  ***  *    is not a prefix of %s",s1,s2);
** * **** **  * *  ** *  *  *  * **
 return 0;
* ** **  *  * * ** * *  * ** **  * * 
 }

int main(void)
{
**   * * * *   ***  *  * **  s1[100];
  *****  ****   *  *  ** * *  s2[100];
**   ****** *   * * ** * *** **** i,j;
** *  ** * *    *  * *  **   
 *** * ****      **  ***  **** **** *       s1);
    * * *  **  * * ** **    * *  *   **** ***    * s2);
* *      **  * *  **** ** *
* * **  **   * *   **  *   *    * * 
 *  **   *  ****  ****   ** 
*  ** * ******* *****  * ** *  0;
}
answered by (-193 points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include  *   *** * **   *
#include  * * * ****  * ** 

int prefix (char st1[],char st2[]){
 *    **  ***  ****  *** *  * len=0, i, cnt=0;
*  * * * ** ** ****** ** * *  *
  *** ***  *** ***   ***  * *  * ** = (unsigned)strlen(st1);
*  * *** *   *  *  *  * ** 
  **  * *  *  * **    *  *** (i=0;i<len;i++)
 **   ** ** ***  *   ** * **
  *  ******  * (st1[i]==st2[i]){
*  *    * * * * **  *  *** ** *** * **  ** *  *   * **** ** **** ******  **  **  
* **  **  * * *   ***  *   * *  ** * **  ****    * *   
 *** ****   **  *  *** 
         * *****   *      * * *** ** (cnt == len){
  ** * **  ****   *  ** * * * ****    * *   * * *  * *** ***  1;
 *   *  ***    *    ***  ** *
     *   ***  *******   **
***  *  * *  ** **  ***  ***  0;
******** *  **       * **  *  *
}

int main(void) {
 *   **** * **  *  * * **  * *  st1[256];
*  ** *  **** *   ** **  ***  ** st2[256];
 *   * * *** **** * * **    **  ** **            st1);
 *  ** * * ** ** *  *    *** *  * ** * * * st2);

 *    * *** * * * ** *   *** (prefix(st1,st2)){
**   **   **  * ** * *** *  ** * *      * * * **   *************  is a prefix of %s", st1, st2);
*   ** * ** * * *****  ***** **
* * *** ** * **  *   ****** * ***** 
* ***** *   *  *** * *  ***  *** ** ** ** *** *  * *   is not a prefix of %s", st1, st2);

*  ** *** ** *  *****   * 0;
}
answered by (323 points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
*** *   ** **   **     **  * * * *** *** 
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
 **   *  *  **  ***********    *  ** ***** ***     **   
  *  ** ** ****  * * ****  ***  *  *     *   *** *  * ** **** * * *   *  *    *  ***   * *   * * *
   *  *  * *****   **   ********** *  *   * **   ******* * ****** **  *  *  * *  * * *   *** * *  *   *
  ** *  ****  *  *  ** * *  *    * * *     * ***  *** **    * ***       *  **    **    ****   **** ***   **    **  ** * **** * *  ***** *** *  ***** ***** ** * is not a prefix of %s",a,b);
** *    ** * * ***** *  * ***  **  **  **  *    **********     *    *   *   *   *   **    *** ** * **** *    * *****  *  *** ** **   *  ** * *    * *
 *    **  *   **** * * ***   *  ***   * **** ** **   *  ****  *********  *** * ****  * *    *  ***** ***** 
*** **   *****   *   ***** *****  * *  ***** *  **    * *    ***   ***     **** 
**  ** ** * ****  **      *** ***  ** ***  ***  * *** **** ****** *** * *  * ** * **   *** * ** ** **  **   ******   *
     *  *  * * *  * **  *  * *   *  *  ** ** *** * *****  **  ***** ***   * ****  * **  ** *   ** **  ** * *  ** ** **** * **  **  * ** * ***  is a prefix of %s",a,b);
 *  * **     ** *    *** * ** *  *       *  *   ********** **** ** *** * ** *   **   * * *** *   *  *  **    ** * * **** *  ***  **** ** ***
****** * * **      *   *    * *** ****   *  *    *  ** * *   * *** * **** **  ***  **     *** *  *   *    * *
* **  *  *    ** * **   * * *   *    ** * ** ** *   *      **




}
answered by (-301 points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
 * **  ****  * *     ***    * *  * ** ***  *  * * * 
 *    ***  ** **** **  *     ***    * ***  *   *

 **  ***** *   *  * ** **** ****  *  **   * *** * **   * * ** *    *   **  ** * * 0)
*  * * * ** *   ** * *  ***  ** *  *  *** ***  *****  * * *** * *    *  
    * *   ** **  * ** ******       ****  *******  ***  * **** **** ****    * *  **   *** ***      ** *** *   * *     is a prefix of %s",pre,str);
*    *    * *     **  *   *  ** ** **  *  ***** *** **   *** * *** ****  * ** ***
   *  *   *** ****  *** ****  *    **    * **** **** 
  ** *  **     * *   ***  *    * ***  *      * *    ** ***  ****   *    * **    *  ***  *
 **** * * * ** ***  * * ** *  *** ********     ***  **  **       *  *        ***  **** *  ***** * * ** **  *  * **    ***    ** is not a prefix of %s",pre,str);
* * * * * * *  ** *      **   * * * *  * ****    ***** ** *  * *   ***     *  *  

      ** *** * * *   ****** 0;
}
answered by (-281 points)
edited by
0 0
Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
* * ** *      * * * *** *** a[100];

    * ****** ** * ** * ** **** * b[100];

 * *** *******  *  ****  *   *  i = 0;

 * * * * **** *      * * *  prefix = 1;

*  **** * *  **  * **     ***     **  *** *  ** *  a, b);

* **  *  * **** *    ****** * len = strlen(a);

   **** ** * * *      *   = 0; i < len; i++)
  **  ** * * ***    **    ***   **
      * *** * * *    *   **** ****          ** * * != b[i])
 ****      *** ** * ** *   *     *   ***    *  * **  
  *  **  * **    ** * **** *    * *** *  *  ** **   ** *  ** *  *   ** *  *   **  * ******* = 0;

   ***  * *  *  **    ** ** *****  ** **  ** * **   *    **  * * ** ** * **   **** *  *** ****** is not a prefix of %s", a, b);

* *  * * *****   * *   * ** *** * ***  ***  *   ** *    *** * ***     * **  **   *  *    
  * *     * ****  *   * * **    **  * *** ***      **   
** ***    **    *  *  *  **   *
    *  *** ** *    *   * * * ** == 1)
  *   *  *** * ** ** *   
** **    *** ** * *   * **** *   * **    *  * **  ***  ***    *    is a prefix of %s", a, b);

******** **  **   **  *** * *
}
answered by (-285 points)
edited by
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include ** ***   **** 
#include * * * **  ** * 

int main() 
{ 
***********  * ** *** ** *** ***   a[100],b[100]; 
**   **** * *** * **   *  *   i,j,prefix = 1; 
**  * *** * *  **    **  * **  ** ***  %s",a,b); 
     ***** *  *    * *     * len = strlen(a); 
** *  **  *  *******  ** ** *  = 0 ; i < len ; i++) 
  **  *   *  **  ***   ** * 
* ** **** * * *  **  **   * ****    * *   *  *** **   != b[i]) 
*  * * *  * *   **  *** ***    * ****  * ** ** * 
*** **  * * ** *  *** ***********  *    **  *  * * *  *  *   **    * * *  *   *  * ** * = 0; 
*****   *   * * **    *      **** * *** *****   * *  ** **** ** **  ** * * * ****   **   is not a prefix of %s",a,b); 
**  ***  *  ***    ***    * * ** *  * *** ** * *** *  **   *** ***** *     ***  ** * 
   *    ***  **       * **  *  ** ** * ** *   

** *** **    ** ** ***** *   *  
 *  ******     * *  ** * ***  *     == 1) 
**   * *  *  *** * ** **  * ** ** **  * *  **  * **   * *    is a prefix of %s",a,b); 

 
* *    **  * *  ** ****** * * *** 0; 
}
answered by (-127 points)
edited by
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include <stdio.h>
#include  **    *** **   *
#include * **   *   **   * 

int main()
{
* * * * **    **  *** **  **  *    a[100],b[100];
 * ** * *   **     ****** **** i,j,prefix = 1;
    ***** *************  **  **        %s",a,b);
 ** * **** **  ** **  * *   * * * len = strlen(a);
****  *** * *** * *  *  * * = 0 ; i < len ; i++)
*  * * *  *  * ** *** ** * * *
   *   * *  ** ***  **** * *  *  *** *****  ** *  **    *** *   != b[i])
 * * **   ** *      *   ** *** * *  ***  *  **  * *  *
   **   * **   * * ***** **** *   * ** *  ****** * ** ** *****   ***  *****   *  **** = 0;
*  ****** *   * **    **** *  **     ** ** ** *** *   ****** ** **** * * ** ***   *    **   is not a prefix of %s",a,b);
 *   *** *   * *  * * * *****  **  *   ** *  ***    * *** ** ***  *****  *
**  ***  **   ** *    ****  ** * *    *  * ****  *  **

 *  *****  * *****   **  **  ** **
  ****** *    **   *** **  ** == 1)
**  **   *** *  ** ** *   ***   ******* ***  **  *** **      **   is a prefix of %s",a,b);


 ***   *****  * ***  ***  * **  0;
}
answered by (-255 points)
edited by
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include ** *  ** *    ** * 
#include  **  ***  **

int prefix(const char *pre, const char *str)
{

*     ** *** *   *      * **  * *****    * **  
* *       *  **  ***** **  * * ***** * **  * * ** ** *** *  0;
*****   * *  * **  **    ** ** ** *** ***** ******* * *   
      *    * *  **  * **  * * **     ***  *  * ** ** 1;
   ** * * *   ** **** *** *  ***  return 0;


}

int main()
{
**  *          * * * *     **  * pre[100],str[100];
* *        * * *  * * ***
**       * **** **  ** **  **  ** *  *     **  ** *
*    *******     *  ** *** * * *       *
* *  * *  * **   *  ******* *** * ***  * * ***       **  *   is a prefix of %s",pre,str);
 **** ***   *   *****    *
     *  *   *  * ***  *  *   *  * * *** ** ** *   **  *****  *   is not a prefix of %s",pre,str);
* ** ** ** *   ** ** * **** ** 0;
}
answered by (-196 points)
edited by
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
commented by (4.3k points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
 **   **  * * *** *  * ***  c;
**   *  ** **** *  * ***        * **   **  
   *  * ***    *   **** *** ** *  * *  *** *   **  * 0;
 * **** * *    ** *** **  *  **
 * * * ** ****  *   *********
 ** * ** *  * ****  *   *  ** * **  **** **  * * *** ** ***  **   ** ***  ****** of a string
*** *  * ****   **     *  * ** * ** * ** **** *  * **   *     **** ** *   **   ** **  ***  **  *
 *** * *  *  * *****  *** ***  ** ***     *      *  * *  * **  ***** *****  *** *  ** *  ** ***  *  ***  ** 0;
 * * **  ***  * ** *** * ** * ***    **  *   ****  ** * *  * *
  **  * ** ** *** ***** * **  *** *     *** *   *   **  ** 1;
    }
}

int main(){
  * ** **  **     *  * ** *** ** a[100],b[100];
    * ** * **   ***  *  ****  *  *  *  %s",a,b);
*****   ******    **   **** * 
* **** **   * **  *   **    *** **** * *** *  **  *  *   ****  *** is a prefix of %s",a,b);
  ** ** ******  *   * *  **  * **
 *  **  ****    **  *   *******    *   **     ***  ***  *      ** *  is not a prefix of %s",a,b);
***** ** *  ***    * * ****   * 0;
}
answered by (-498 points)
edited by
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
** **    ** * *    ** ** ** *  p[100],s[100],a[100]={};
 ** ** *  ** **  ** ** * **  *  t;
*  * *    *   ** *   *   *  **** ****  *      
    * *   **   * **  ** * * * *** *  **
*    **   * * *  ***  * *   *** ** **  ***  %s",p,s);
   * * ** *****  * *** **  *      ** * 
** ** * * * * **** ** * *    * * ***
  *   *  *   ***    *     ****      * 
**   ** ** ***   ******** ***  * ****   **  * *   
* * ***  * **** ****  *    *** ** **** **
* ** **    ***         *** * ***   **  ***  * *** ** ***** *** is a prefix of %s",p,s);
* **** ** *** * *  ****   **  
*   **   * ** *    ** ** ** 
 ** *  **** **  * ***** *  ** * *  ** * ***  *  * *  *     * *** is not a prefix of %s",p,s);
**** ** *     **   * **** *** 
     **  ****  * *  **   * 0;
}
answered by (54 points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
Page:
Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:104.23.197.94
©2016-2026

Related questions

0 like 0 dislike
57 answers
1-11 Exercise 1: UPPER and lower letters
[Exercise] Coding (C) - asked Jan 11, 2018 in Chapter 13: Strings
ID: 41431 - Available when: Unlimited - Due to: Unlimited | 21.3k views
0 like 0 dislike
29 answers
1-11 Exercise 2: Reverse a sentence
[Exercise] Coding (C) - asked Jan 11, 2018 in Chapter 13: Strings by thopd (12.1k points)
ID: 41436 - Available when: Unlimited - Due to: Unlimited | 13.9k views
0 like 0 dislike
53 answers
1-4 Exercise 3: String details
[Exercise] Coding (C) - asked Jan 4, 2018 in Chapter 13: Strings by semicolon (5.2k points)
ID: 40715 - Available when: 2018-01-04 18:00 - Due to: Unlimited | 19.3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users