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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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;

 ** *     * * ***  *****   * ***       p);
 ***  *** ***   * * **   ***   *   ***   **  * s);
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* **** ** *  *   ** ** ** ******  * *    **  ***** **      **   is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
0 0
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];
******* * ***  *   ****** ***** *  ****   * ***  ****
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    }
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**  * * ** *  ** **  ***  **** *** *   * ** ** * * *  ** ** *** ******* ** *    ** * ** **  * * * ** * *            *  * * * *** * is not a prefix of %s",a,b);
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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
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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
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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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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;
}
answered by (-323 points)
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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
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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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