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)
***  *  * *  is a prefix of **  *     ***** 

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


}
answered by (-336 points)
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Hidden content!
#include<stdio.h>
#include<string.h>

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

*** * *** **** * *       *** **  ***** * p);
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*    ** *     ******   *   *   **  *  ** *  *     *  *   * *   is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
0 0
Case 0: Correct output
Case 1: Correct output
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0 0
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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)
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
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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)
  ***** *  * *   *  * *  * 
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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
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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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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)
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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
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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