1-11 Exercise 3: Prefix of a string

0 like 0 dislike
7.2k 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 | 7.2k 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:172.69.59.175
©2016-2025

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 | 10.5k 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 | 6.9k 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 | 9.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users