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:172.70.179.203
©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 | 12k views
12,783 questions
183,442 answers
172,219 comments
4,824 users