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);
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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)
 *** *****   is a prefix of  * ** * *  * *

   *         **  *  *** ***


}
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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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Case 2: 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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    int l1,l2,i=0;
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*  * ****  *  *  *   ** * *   *** ** *  
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    }
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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)
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
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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;
**** *    * ***** ** * *  * ***  *   * *  *   *****
   * *       * **  **** *  
  * *  ***   **       ****** *  *  * * **   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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Case 2: Correct output
commented by (4.3k points)
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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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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
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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