1-11 Exercise 3: Prefix of a string

0 like 0 dislike
6.5k 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 | 6.5k 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:108.162.216.168
©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 | 9.3k 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 | 6.3k 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 | 8.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users