1-11 Exercise 3: Prefix of a string

0 like 0 dislike
12.2k 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 | 12.2k views
0 0
12345
commented by (-329 points)

27 Answers

0 like 0 dislike 
Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
 * ***  *  *  * ***  *  *  *  **  n[999],str[999];
*  **** ***** * ******** ** ** **    *    ***  n);
   * ** * **  * *  *  ** *   *       **     **  str);
 *   **** *  ** ** **    **  * *   *     * ** **       * *     ****** **  ***** ** **
***   ** *  *  * * *   ****        ** *  **** *        **       ** ***** *******  * **   **    ***    * is a prefix of %s",n,str);
* **  ** ****  * * * **   *  *   ** * ***  **  ***  *   *
* * *    *   * *** * *****  *    ***   *   **  *** *    
* *  *  * * * ******   **** ** *   ** *  ** * **** * *     * *****   ******** *  * **     **  is not a prefix of %s",n,str);
  **  **   *  * *  *   *    **  ** ****     *  **  * 
**  ** * ******  ****      *     0;
}
answered by (-249 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
-----------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
prog.c: In function 'main':
prog.c:9:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
     printf("%d",strlen(n));
              ^
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:9:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
     printf("%d",strlen(n));
              ^
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!
  *   * **    **  * *
 *   ***     *  *  *  

int main()
{
 * *****  * * ** ** * i,plen;
 *    * *      * *   ***     *  *
 * ** * * * ***** ** *  **** ** *** ** *  ***
*  *  ***  **** **  **   ** *   * *   *    * * 

* *  * *     *  * * * *   ****  ** * *    

      ***      **  ****      **  **  ** **   i++)
***** **    **  * *  * *  *  *    *

**  *  ** ** * * * 
* ****
***** *   ** is not a prefix of * *** **  
return 0;

 }


if (i==plen-1)
*  *  *   * is a prefix of ** *  * ***   

  * ** **   *** ******    *


}
answered by (-336 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 main() {
 *  * *  * **   *   *** p[1000],s[1000];
 * *  ***  *  * * * * * * *   **  i=0,re=0,len;

   ** **   *  *  *** *     ** ******* ***  *    p);
 * ** ** *   * ****   ***  **    *   **  s);
    *  **** * **   *    * ** *** ** * * *

 **    * *** ** *  *       * *  **  ***     {
*  * * ***  **** *  *  *  * ** * ** * * * ** * * * *  * * *** *   {
 * **  *   * **** ** ***     ** *  **  ** * *  ** *  * *        **** * ******** *   *** 
***   * **  *** *** * ** ***  * *****     * ****** ** ** *     *   **** * *** *
*  * **   *  **  * * * *  * *   *    *** *  **  *  *   
 *****   * ***  * *  ***  * 
 ****  * ** * *********** **     {
****** **** **   *  ***       * ****   * * **   *  ***  * ** *** * *  is a prefix of %s", p, s);
 *    *** * * *   ** * *  **
 * **  * ** *         **** * * ** ** if(re==1) {
 * ***   ***  *** *  *  *  * * *  * **    *  **   *     * *  * *  ** *  is not a prefix of %s", p, s);
    }
}
answered by (-120 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 main()
{

*    *****    **   *   * *  a[100],b[100],c[100];
*** *      **** ** * ********* ***** * ***  ***  *   *
    int l1,l2,i=0;
* *  ** *  *  **  **  ** *  ***  
****   ** ****** *  * * ** * *    *** *
***     *    ** *  *  ** ** *****  ***  
  ** **  **********    *  * * **  **     **  ** * *** *  *****  * * *  is not a prefix of %s",a,b);
    }
*  *   * *** * *       *  if(l1<=l2){
*** *      *    *  *      **   *** *   *  ***  * * ** *** prefix = 1;
  *  **   ***** * *** *  ***  **** *   * * *      *   *     *** * ******
   ***  * *     *  **   ****  * * * ** **  * *    **    * *    ******** ***  *   **  (a[i]!=b[i]){
* *  **   *** *   ***    *** ** * ** ********** ** **  ** *** ***** *** ** **     * ***  * * * **  * *      ***    is not a prefix of %s",a,b);
   *  ******  *  * **        ** **  * *   * *   *    ****** *    * ** * ******** **   * **** *****  *      * = 0;
 ** * * ** * *** * **** **  ** ***  * ***    * * *  *   * *  * *   *  ***  ** *** ****   *  **  ***  * * * *  ** **
**       ** **  * * * ** ***  **** ** * * **  ** * * ***  * ** **** *   *   * * *  *****  *  
****  *** ****     **   * ***  **    * *  ** * ***
 * *   **  *** * * * **     **  * *    *** * * * *  * *  **  == 1){
 * *  ***   *    * **   *   * **** *  * *   ****      * ***  * ***  * ***      *   ***    * is a prefix of %s",a,b);
   *** ** * ****    *  **  **  *  *** *  *   *   
    }
}
answered by (-329 points)
0 0
prog.c: In function 'main':
prog.c:8:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:8:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:7:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:7:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^
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 *** ***  *  
#include  * * **      

int main()
{
 *    * *  **   * **  ***     prefix[100];
*   *  ** ** ***  * * * ******    word[100];
** ****  **  *****  ********  %s", prefix, word);
   *  * *** *      *        i;
  *   * * *  *  ***  * *** = 0; i< strlen(prefix); ++i)
 *  ** * ****   *      ***    *  *
* ** * * **    ****  *  **  ** * * ****  * **   * *   **   *** * * *
*** **** *  ***** *    **  *  *  *** *   ***      *  *
 **    *   ********  ****  **    *     *  **    * ****** ** ** ** * * ** ***        *** **    ** ***    *   is not a prefix of %s", prefix, word);
   *      *****  **** *  * ***  ** * *       *    ****   ** **** * *   *  ** * * **   * 0;
 * *  *    ****       ****  ***  ** ***** ** * ** **  **  *
***  **  ** *  * *  ** * **    
*****   ** ** ** *  *   * ****  ******      * is a prefix of %s", prefix, word);
***  ** * ***  ***       **   * * 0;
}
answered
edited by
0 0
prog.c: In function 'main':
prog.c:15:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
prog.c:17:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:15:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
prog.c:17:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
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 *** *   ** **  **
#include **  * ** *** *  

int main(){
*  ****   * * *********** *    p[100],s[100];
 *   * * ***** *** *  **  * * ** * *  ***** *****
   * **  **** *   ***   ***   bf=1;
 **   *    *    **** * ** * *         * ***  *****  * 
   *     * * *** *     *** ********  **  *    * *    ** bf=0;
 **     * *   * *  *   **  *  

*** * *  ***  ***    *  *   * ** *  *   *  is a prefix of %s",p,s);
  **** * * *  ** **    *  *   *** * **** **** * is not a prefix of *  ** ** * 
    **  *** *****   ****** *  * ** 0;
}
answered by (-116 points)
0 0
prog.c: In function 'main':
prog.c:5:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:6:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:8:19: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(int i=0;i<strlen(p);i++){
                   ^~~~~~
prog.c:8:19: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:8:19: note: include '<string.h>' or provide a declaration of 'strlen'
/tmp/cclwPOj6.o: In function `main':
prog.c:(.text+0x26): warning: the `gets' function is dangerous and should not be used.
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:8:19: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(int i=0;i<strlen(p);i++){
                   ^~~~~~
prog.c:8:19: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:8:19: note: include '<string.h>' or provide a declaration of 'strlen'
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
-----------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 main()
{
 * ***    ****  * *** *  ****    i,count=0;
 *** *  **   **  *  *****  ** string1[100];
  ***  *   *    *  **   ** *** * string2[100];
 ** **     * **** ****  ** * *  *** *  ** *   *  *** * 
 * ***  * * **  *   *** * * * * ** *** ** * * ** ***

*  ** * ***** **    *   *** * *   ** *******
      **   *** ***    *   *    
     ** ** * * * *  *****     * *** ** *    * * ** **** *****  **  *** *    *  *
  * *** * * ** ***    * *****       **  *  * **** * * *  *   **
* **     *    ** **** * ****  ** * ** ******  *    **  ***    * ******  *  ****  *  *
* *** **   *  * *  **  **   * * ****   ****     * *   * *
    }
  * * ******   *** ** * ****  *******
*** * * ** **  *   *   * *
*  * * **** * ** **  ******* *  *   * * * **    * ***    **   **   *** is a prefix of %s",string1,string2);
  ***  * ********* * **** **
* **  ** * **   *     *    *  * *
*   *   * *  *  ** **     ** 
* ** **  ** ****  *   *   *    *   * **     ***   * ** *  *** * * * is not a prefix of %s",string1,string2);
 *** ** *   **  *   ***  * 
 ** ** *  * **   **  ******   * 0;
}
answered by (-323 points)
edited by
0 0
prog.c: In function 'main':
prog.c:9:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string1);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:10:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string2);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/ccIBxtbQ.o: In function `main':
prog.c:(.text+0x2f): warning: the `gets' function is dangerous and should not be used.
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
-----------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:162.159.115.32
©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 | 17.6k 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 | 11.6k 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 | 15.7k views
12,783 questions
183,442 answers
172,219 comments
4,824 users