1-11 Exercise 3: Prefix of a string

0 like 0 dislike
8.7k 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 | 8.7k 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:172.70.100.197
©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 | 12.7k 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 | 8.5k 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 | 11.7k views
12,783 questions
183,442 answers
172,219 comments
4,824 users