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:172.69.59.82
©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 | 14.2k views
12,783 questions
183,442 answers
172,219 comments
4,824 users