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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27 Answers

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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
** *      *   ****** ** ** ***** * n[999],str[999];
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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 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 2: 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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  **** * ** ****   *  **  * **  * **  *   **

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    }
}
answered by (-120 points)
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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()
{

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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)
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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
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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)
* *   ** * *    *  *  * *
* **** * *  ** ****       * ********** * *   * *  * ** * * *   **** ** *  * 
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*  ** ** * * * * *  * ** *  * * *     ***  *****   *   *  * ** * * ** * *** **** * * * **** 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
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;
 ****    ***** ** *  **  *    ****   * **   * ** **
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**   **   **   *  ** *        

  *      *    * * *       * *   * * **** * 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 1: 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.
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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
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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