1-11 Exercise 3: Prefix of a string

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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
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27 Answers

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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
 **** * ** **  * ***  *  n[999],str[999];
 *      *** * *  ** * ** **** ** *** * ** **  ** n);
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** **   **  ****  * *   *   *   * ** * *    * * ***   
  * * ***  * ** *   * * *   ** 0;
}
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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));
              ^
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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));
              ^
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Hidden content!
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**    *** * * * ** * 

int main()
{
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return 0;

 }


if (i==plen-1)
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 *       * ** *  ** * **  ** *


}
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Case 0: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
 **  *****  * ** **   ***  *  *  ** p[1000],s[1000];
** * ***** *** **        i=0,re=0,len;

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 *  *  **** *      **     *    **** ****  **** * ** * * **   * **   is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
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Case 0: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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    }
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**    *** **   * *    ** **** * * **  **** * **  ** *
    }
}
answered by (-329 points)
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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)
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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)
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Hidden content!
#include   * * *     **   *
#include     ***** ***
#include ** *   *  *

int main()
{
****  *   * *  **   * * *** ** prefix[100];
* **** *** *** *  **  *      *    word[100];
  *    *   **  *  **  ** ***   %s", prefix, word);
** *   **** ***  *  **    * i;
**    ***  ** ** * *   *  * = 0; i< strlen(prefix); ++i)
* **   * * **     *
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*    **** ******** *   ** *** * * * **    *     ** **
*    * ** *  **  ******       * *** ****     **  ** **     *  * **  *  * *   * * *  **   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)
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Case 0: Correct output
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Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include   *   **  ** * ** 
#include **  *  * *   * 

int main(){
 ***  * **     **  * *    ** p[100],s[100];
* **       ***        ***  ** ****** * *       *** *  *
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***    **** *  *   *  *   *      *   *  *      * *  
***   * ** * ***   **     *   ******  **  ** **  * ***    * * * 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.
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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)
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0 0
-----------Re-judge-----------
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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;
}
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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)
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Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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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
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