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

int main() {
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    ****  ******   * **** i=0,re=0,len;

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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 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
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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)
 *  * *     *  **   ** *** * **
 *  **  *    *** ***  *** * ******* ***   * *** *** *  ***** **    ** *
*****  *  *****  **  ** ****** * * * * * *** *  *     
 **   *      ****    * ****  **** ** *****  * * *      ** ***** **   * ***  **   **   **  *  **    is not a prefix of %s", prefix, word);
*  *       * ****   *   **  *  * *   * ***  ** *  ** *   * * *** * * **  *  *  ** **  0;
      ** ****  ***  * *    ********** *  *   *  * ****
**** * * ****  *   **  ** ** 
 **    **  * * *     ***   * **  * ****   is a prefix of %s", prefix, word);
* **  **** *   **  *  *** * * *   0;
}
answered
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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("");
            ^~
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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)
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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 0: Wrong output
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Case 0: Correct output
Case 1: Correct output
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