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];
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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 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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    }
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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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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)
* **  ****   **    ** ** *   
   ** ***   ***  **  ****    *  ***  * ****  *** *   ** ****    * *
 **  * *     ***    ** *** *  * *****    *  **** *    *  *
 **    ***  ****   *       ** *** *** **** * ***  ** *             *** ***   ** *** *    *** 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
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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 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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