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);
 * *  *    * *  **  *** ** ** ** * * *   ****  ***  ***** **** ** *  *  **   ** ***
** **   ****  ** ** ** *  *** * * ****    *** ***    **   * *  * ** **     * *****    ****** is a prefix of %s",n,str);
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*   * **  *** * *      *  *  ** * *  **** *   **      *   * ****  *** * *  **    *  **    **** is not a prefix of %s",n,str);
 **    *  **       ******** *      **** * ** ******   ** 
 *  ****   * ** *   *** * 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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Case 1: Correct output
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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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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 a prefix of %s", p, s);
* * **  * ** * *  ***   * 
* ** *** ** * *  * *  * * ** ** if(re==1) {
**   * * ***  *    ** ***  ***** *  *** * *****  *   *  * ***    ***  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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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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* ** *  ***  ** * ****  * **    * * *   ** *** *****  *  prefix = 1;
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   * **** *   ***  *** *    ** * **  ** * ****  **   * *  **   * *   ***   ***** ** (a[i]!=b[i]){
** * *   ** * * **** *    **** **  *  ***   * ** *** * ** * ****  ** *   * * *****  ***  * ** * **  *   *   *    **    is not a prefix of %s",a,b);
*  ** **  *  *** **  * * * ****  * ***      *  ***    *   ****   ***** *  * ***  **   *  **  *** *      *   *** = 0;
*   **     ***  * * *    * * *  *  * ****   * * *   * ****   *  * **    ** * * ***   **  * * *   *  *****
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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
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)
**** ***  ********* *  * 
**   ***   ** * * **    *     *  **      ** *     * ** *****  *   * *
 *  *****  **** * * * *** *  **   *   * ** ** *  *****
 *********** *  * **     *** ****    *  **      ****    * * **  **  * *     *****  * * *  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
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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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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'
commented by (4.3k points)
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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
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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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