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];
    ** ***      ** *** **   **   ***  * *  n);
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 * ** ***  * *  * * **   *** *   * *      ** *  *** ***  **** * **** *         *    *     ***     is a prefix of %s",n,str);
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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!
* *** ** ***  **   
* *  **    ** **  * *

int main()
{
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** * *    **   * *** *** *   

** * *   * ***** 
* * * **
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return 0;

 }


if (i==plen-1)
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   *  *  ** *** **     *  ***


}
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Case 2: 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;

*** ** * **  * * *** ** **    *   * * * * ** * p);
* **  * *  **    ** ***  **  **** ** *  *** ** s);
*     **** ** ** * ***   ***  *   ** *

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*   ***   **   * *    *** ****    **   * *** **  **** *   ** *   **  is not a prefix of %s", p, s);
    }
}
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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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

 * **       ****** ** *** *  ** a[100],b[100],c[100];
*  **  **** *   *  *  * **  ****  *** *  * **      ***  * * 
    int l1,l2,i=0;
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*  * ** **        * * * * *   * ****    *** ** ** **** ***   * *   is not a prefix of %s",a,b);
    }
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* ****** ***** * **    **  *** * **** **  **  ** ** **   *  * ****  *  ** *  ** **    ** * *  * *     * **  *   * ** is not a prefix of %s",a,b);
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*  **** **    **   *** *  ***  ** * * **     **     * *    *  * *****  * ***   *   * **   * ** *   is a prefix of %s",a,b);
****  **  ** * *** *  *   ****** **     *****  ******  ** * 
    }
}
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
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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];
*  ***** ** ****  ** *  *  *** * *    * *   *   * **   
 **   *  *  *****  ** ** *** 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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Case 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
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0 0
-----------Re-judge-----------
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