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()
{
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*     **** * *   *  ** ****       *  ** *   *   ***** *  
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}
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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));
              ^
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
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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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Case 0: 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;

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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 0: 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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    }
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***     * **         ****     ** * ** **   *  *  **   *    **** * *   *  ** *** *** **   **  *** **  ****** ** = 0;
*** **  ** **    ** *  **  * * ***  ** * * *****   ** * *** * * *  *   * * **  *  ** *  *  * * * ** ** *     **  *
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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
Case 1: Correct output
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
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)
0 0
Case 0: Correct output
Case 1: Correct output
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'
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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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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.
commented by (4.3k points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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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