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);
 *** ** * * **  *  **  *** **   *  **  * ** str);
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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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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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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
 **   *** * ***    * * * **   * p[1000],s[1000];
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    }
}
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Case 0: Correct output
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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);
               ^
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
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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*** *   ** ** ** ***  *******  **    * ******  ***** **
***   * ** **  * ** *** *    ****** *** **** *  ***  * * * * *    * ** *  ****   * ** *   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("");
            ^~
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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'
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-----------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
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