1-11 Exercise 3: Prefix of a string

0 like 0 dislike
11.4k 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 | 11.4k 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:172.69.17.67
©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 | 16.7k 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 | 11.2k 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 | 14.7k views
12,783 questions
183,442 answers
172,219 comments
4,824 users