1-11 Exercise 3: Prefix of a string

0 like 0 dislike
6.2k 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 | 6.2k 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:172.70.178.92
©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 | 8.8k 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 | 5.9k 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 | 8.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users