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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** * ** *  *** **  *****  ** **  *  ** ** {
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*  *  * * *  * *     *   ***    * **** * * * *** *  * *   * ***   * * ***  * * 
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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()
{

*  ****** *  *** * **  ** * **   a[100],b[100],c[100];
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    int l1,l2,i=0;
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***  *   ***  ****  * * ****  *  *****
* * ******   **** **   * *********  *
***  *    *   **  * **  * ** * *    *   **     ****   * * * ** *  * is not a prefix of %s",a,b);
    }
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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
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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
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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-----------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;
}
answered by (-323 points)
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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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