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

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    }
}
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Case 0: Correct output
Case 1: 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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*** **** *   *   **  ** *  * *** *      ********    **
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  * ** ***      ** *        *** ***** * * *   * * ***  *  **
**  ** *  * ****** * **      **
     ** * * *      ** * **  *    * *** 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)
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
Case 1: Correct output
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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'
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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.
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0 0
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
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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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