1-11 Exercise 3: Prefix of a string

0 like 0 dislike
10.7k 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 | 10.7k 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:172.70.126.217
©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 | 15.6k 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 | 10.7k 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 | 14.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users