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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**    * * *** * **    **** *  *** *   **   **  *   * *****   *  * *    * **   ***** **  **  ** 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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Case 1: Correct output
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Hidden content!
    * *  **  *      ** *
  *  *    * * ***** 

int main()
{
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return 0;

 }


if (i==plen-1)
* *****  ** **  is a prefix of ** *   **

   *  * ** *  * **  *  * *


}
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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() {
 ***** **** * *  * *** *  ****  p[1000],s[1000];
 * ** *** ** **** ***      * *   i=0,re=0,len;

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

*  * * *    ***  **  *  ** *** **  * ****  *** {
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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];
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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
commented by (4.3k points)
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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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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;
}
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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
Case 2: Correct output
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0 0
-----------Re-judge-----------
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Case 2: Correct output
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