1-11 Exercise 3: Prefix of a string

0 like 0 dislike
10.8k 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 | 10.8k 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:172.69.130.92
©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 | 15.7k 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