1-11 Exercise 3: Prefix of a string

0 like 0 dislike
9.2k 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 | 9.2k 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 | 13.3k 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 | 9k 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 | 12.3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users