1-11 Exercise 3: Prefix of a string

0 like 0 dislike
11k 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 | 11k 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:172.70.50.50
©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 | 15.9k 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 | 10.8k 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 | 14.3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users