1-11 Exercise 3: Prefix of a string

0 like 0 dislike
9.9k 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 | 9.9k 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:172.70.127.140
©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 | 14.5k 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 | 10.1k 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 | 13.2k views
12,783 questions
183,442 answers
172,219 comments
4,824 users