1-11 Exercise 3: Prefix of a string

0 like 0 dislike
13.8k 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 | 13.8k 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:104.23.197.65
©2016-2026

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 | 19.9k 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 | 12.9k 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 | 17.7k views
12,783 questions
183,442 answers
172,219 comments
4,824 users