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
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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);
               ^
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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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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 2: Correct output
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Hidden content!
#include  * *** *    * *  
#include  ** * *  * *  ***

int main(){
 * ** * * ******* *  * ***    * *** p[100],s[100];
** * ** ***   ***   * ** * ***   ***  ***  *** 
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** *   ** ** *     *** **   *        *** *   *  
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  *** * *  *** ***  ***  **  *** 

 * *  **** *  *   *** *  *    * ****  **    *   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];
*     * ** *  *  *****  *     ** *     **   * * ** * 
*** * * *   **  * * *  * *  *** * **    ****** *  

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**  *  *    *  * *  * *  * *  * *   *** *** ** ** * * ** *  * * 
*  * ** ** ***  **  * **   * * ** ***  *** *     *   *******  
***  ****    *********** **   ** **  *   *** * ** ** ***  *   * * ****  *   **** * ** * ***
 *** *** **  * **  * * **  * *  * **  * **    *    ***  
    }
 *   **** * ** **       * *   * ***** *
 ***   * **   **   *
** **   ***   *   *** *** ** *  * *      ***  *****   *    *   * 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
Case 2: Correct output
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-----------Re-judge-----------
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