1-11 Exercise 3: Prefix of a string

0 like 0 dislike
9k 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 | 9k 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:172.69.17.66
©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 | 13.1k 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 | 8.8k 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 | 12.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users