1-11 Exercise 3: Prefix of a string

0 like 0 dislike
13k 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 | 13k 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:162.159.115.10
©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 | 18.8k 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 | 12.4k 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 | 16.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users