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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Case 0: Correct output
Case 1: Correct output
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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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Case 0: Correct output
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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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Case 2: 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);
               ^
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
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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 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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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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Case 1: Correct output
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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
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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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