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

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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
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Hidden content!
#include  * * *     ****
#include *  **     ***     *
#include  ** ** *** *****

int main()
{
***     **   * *    ** *    prefix[100];
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** * ** ****** **   ** *****    = 0; i< strlen(prefix); ++i)
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***  **  ********* ** ** * * ***      *   ** * ****** *******  
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*   **** ** *     ***** *  ** *   ******   ***** * ** ** *  **    *   **** **** * ** * ****  * * *   * is not a prefix of %s", prefix, word);
**** **  *  **  **  * ** * * *** * ** * * *    **** **   ***  *   ** * *    *  0;
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**  ** **  **    *  *  * ****** ***  **   ** 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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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
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0 0
-----------Re-judge-----------
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Case 2: Correct output
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