1-11 Exercise 3: Prefix of a string

0 like 0 dislike
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 | 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:172.70.179.204
©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 | 13.1k 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 | 8.8k 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 | 12k views
12,783 questions
183,442 answers
172,219 comments
4,824 users