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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******   *  *  *****  **       *** ******   *  ***  *** *** 
  ** **  *** * * * ****  * *    * 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
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Hidden content!
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int main()
{
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return 0;

 }


if (i==plen-1)
*  **  ** *** is a prefix of  *  *  ***

**     **** ** **  * **  


}
answered by (-336 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() {
       * **** *  **   *****  **   p[1000],s[1000];
      *** ** *     **  **  ***   i=0,re=0,len;

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** * ***   *** **    *    **  *   ***  *  * ** ** *** s);
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   ** *  *    *** * *      ** ***  *   *   ****   *  **** *  * **  is not a prefix of %s", p, s);
    }
}
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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* *** *  *  * ** * * *     * *****  **    **   * *** ** ***  * * **** ** *  * *  *** * *** * ** ****  * * *  * ***     *       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)
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
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0 0
-----------Re-judge-----------
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 ** *    ** *    *
#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
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;
*  * **  **  * ***  **  **** **  * ** * ** * ***     
   **    *    **  *  ***** *        **** *********    ***  * ** 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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-----------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
Case 2: 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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