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:172.70.179.203
©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 | 12k views
12,783 questions
183,442 answers
172,219 comments
4,824 users