1-11 Exercise 3: Prefix of a string

0 like 0 dislike
13.7k 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 | 13.7k 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:104.23.197.95
©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 | 19.7k 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 | 12.8k 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 | 17.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users