1-11 Exercise 3: Prefix of a string

0 like 0 dislike
9.9k 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 | 9.9k 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:108.162.241.33
©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 | 14.5k 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 | 10k 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 | 13.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users