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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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
Case 1: 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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    }
}
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)
  ** **   **  * ** * *  * * *
  *   *  * * * ** ***** * * *    ** *** * *   *  *** ***        * * 
  *   * * *   ***   ***   *   **   * *  *  ***** 
***     ** ** * ****  *  ***  ** ***  * *   ** * *  ***   *  * **  ***  * *        * ** *** **  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
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include      *  * *** *   
#include    * **  ***  *** 

int main(){
 **  **** **  * * **  ***** p[100],s[100];
 ** ** *** ********* * **  * *******   *** ***   *
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 * **    **  ************ * **   **** * * 
  ** *   *       *  ** ****   ****  ***     **  ******  * ** *  * 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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0 0
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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
Case 2: Wrong output
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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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