1-11 Exercise 3: Prefix of a string

0 like 0 dislike
11.1k 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 | 11.1k 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:172.69.130.92
©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 | 16k 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 | 10.9k 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 | 14.4k views
12,783 questions
183,442 answers
172,219 comments
4,824 users