1-11 Exercise 3: Prefix of a string

0 like 0 dislike
12.6k 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 | 12.6k 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:104.23.197.95
©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 | 18.4k 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 | 11.8k 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 | 16.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users