1-11 Exercise 3: Prefix of a string

0 like 0 dislike
14.1k 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 | 14.1k 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 | 20.2k 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 | 13.2k 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 | 18k views
12,783 questions
183,442 answers
172,219 comments
4,824 users