1-11 Exercise 3: Prefix of a string

0 like 0 dislike
7.2k 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 | 7.2k 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:172.69.17.24
©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 | 10.5k 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 | 6.9k 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 | 9.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users