1-11 Exercise 3: Prefix of a string

0 like 0 dislike
13.8k 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 | 13.8k 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:104.23.243.109
©2016-2026

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 | 19.8k 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 | 12.8k 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 | 17.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users