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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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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    }
}
answered by (-120 points)
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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
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0 0
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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;
**   ******   **  * ***  **  ******* *   *  ** *  *   ***  *
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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("");
            ^~
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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("");
            ^~
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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;
         ***  *****  *  *  **  * * *****        ** * 
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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];
* ***    *  ***** ** * **    *  *     *  ***   ** **
**** ****  * * **** **     * * ** *  ** **   *  

   **** ** *** ** * *** * * * *** **   ***  *
 ** * * *  *** **** * *** * * 
**    ** * *** ** *  **    ***  **  *  *  *** ** ** *    * * ******       * * *
** ** * *  * * *  * * **** * * *  * * ** ***** 
** ** ** * ** * ****  ** ** * *  * *** **  **** *  *    ** *    ** *** **   ** *****   
 **  *  *  **** *  * ****** * * ** **** *   *** **     ** 
    }
* *** ** * * *  * * **   * *** 
**     * **    ** ****     * ** 
 ** * * **  *   * ****** **** **     ** *    *   *  *  * ***** ***     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 1: Wrong output
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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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