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 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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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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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-----------
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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;
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****  *    *** *   **** * **  
*** * *     ****   * * *** *   *******    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("");
            ^~
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Case 0: Correct output
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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
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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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