1-11 Exercise 3: Prefix of a string

0 like 0 dislike
6.2k 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 | 6.2k 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:172.70.130.195
©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 | 8.8k 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 | 5.9k 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 | 8.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users