1-11 Exercise 3: Prefix of a string

0 like 0 dislike
7.3k 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 | 7.3k 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:172.70.126.62
©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 | 10.6k 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 | 7.1k 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 | 9.7k views
12,783 questions
183,442 answers
172,219 comments
4,824 users