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:172.70.178.92
©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