1-11 Exercise 3: Prefix of a string

0 like 0 dislike
10.9k 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 | 10.9k 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:172.69.7.60
©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 | 15.8k 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 | 14.2k views
12,783 questions
183,442 answers
172,219 comments
4,824 users