1-11 Exercise 3: Prefix of a string

0 like 0 dislike
12.3k 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 | 12.3k 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:104.23.243.165
©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 | 17.9k 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 | 11.6k 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 | 15.8k views
12,783 questions
183,442 answers
172,219 comments
4,824 users