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];
***       * * *** *** ***  ** **    * ** * n);
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***  * * **  ***  ** **  ** **  *  * *  **    ** * *     *      *    *    *** *****    ** *** is a prefix of %s",n,str);
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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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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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** *** * ***  ***  * **   * **  * *  ***   ***  *  ** **  *   ****    is not a prefix of %s", p, s);
    }
}
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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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***  * *  *  * **  ***   *** ** **  * ***   * * * *     *  *  *    ****    ** ** * *** ****** *    *     ** is not a prefix of %s",a,b);
**   ***          *  ** ******  ** ***  *     *  **    * ***   *** * *  *     * ** * *  * **     ** *   * * **  * ** = 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)
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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);
               ^
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
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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("");
            ^~
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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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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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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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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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