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];
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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() {
*** *** *** * *  * * *    *** p[1000],s[1000];
 * *    * ** * * *** *   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()
{

   ***  *  * * ******    *  a[100],b[100],c[100];
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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);
               ^
commented by (4.3k points)
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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 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include *  **  *  *  
#include * *    *   ***     

int main(){
**   *    *    *** **** p[100],s[100];
**   *   * *  *  ***   *** ***    **   **        * **   * *
 * * **      * * *  **  *    **** bf=1;
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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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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
Case 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
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0 0
-----------Re-judge-----------
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