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:172.70.80.171
©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 | 12.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users