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