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));
              ^
commented by (4.3k points)
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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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Hidden content!
#include<stdio.h>
#include<string.h>

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

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    }
}
answered by (-120 points)
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Case 0: Correct output
Case 1: Correct output
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0 0
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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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    }
}
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
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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Hidden content!
#include      *   ****  *
#include  **  ** * ***
#include * **   ** ***

int main()
{
** **** **      **  **    ***  prefix[100];
   *  **  **  *****  **      ** * *    word[100];
*  *** *   *        * **     ******    * %s", prefix, word);
   ***  *  * ** * ** *** * *** i;
  * **** *      *  * *****  *  * = 0; i< strlen(prefix); ++i)
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** * ***    **  * *    ***  **  *** ** *  ** * **   *    *** *  * 
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 *  * *** *  *  * *  ** *     **   * * ***  ** *  
 * ***** *   ** ** ******   **
  * ** *  **    *   *   *** ***    ** **  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)
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
Case 1: Correct output
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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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-----------
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Case 1: Correct output
Case 2: Correct output
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