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

int main()
{
 **  *** ** *  *     ***  *  *    n[999],str[999];
     ** *** ** ***      *    *  **   ** *  *  *  *    n);
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 ** * ** * ***  ** *    * *  *  *   * *     **  *   ********* *  *  *      *  ** * is a prefix of %s",n,str);
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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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Case 1: Correct output
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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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Hidden content!
#include<stdio.h>
#include<string.h>

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

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* *** ** * * *** * ***  * *   ** ***  * **  s);
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*  *** *  ** * * * ** * *** * *    * {
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* * *  * ** ***   *   ****    *  *  ***** ** * * * ** *  **    * **   is not a prefix of %s", p, s);
    }
}
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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);
               ^
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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);
               ^
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Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
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Case 2: Correct output
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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)
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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 2: Correct output
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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.
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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'
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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.
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Case 1: Wrong output
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0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
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