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);
  ** *** *    *  **  *   * ** **  *** *    str);
*** **  ** *** ***   ** * *   ** **  ** ***  **  * ** *   *   ***  * * *  *    
    ****     ** **** ** * ** *  ** * *   **  * **   ***** ** **** ****    ** **  * ***   * *  ** is a prefix of %s",n,str);
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** **     *** * * **   * *        * ********    * *   ***
** **   **** ******   **** * **     ** **  **   ***** **   *  *    *    ***** ** *      is not a prefix of %s",n,str);
   ** *    *   ** *** * *  *  * *** *    **   ** ***  *  * **
  ***     *  *****  *   *   *  * 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!
*** *   ***** * ***
***     *  ***   **  *

int main()
{
*** * *  *** * * **  **  *      **  i,plen;
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*****  ****     ******

** **  *  ***  * 
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return 0;

 }


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

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


}
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Case 2: 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;

  **  ***  ** *  **  *      *   ***  ** *  * p);
**  **** *       *** ****    *  ** * ** * * ** * * * s);
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* * ** **     *** **   * * **   **  *    *  ***  ** *    *** is not a prefix of %s", p, s);
    }
}
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

    ***   ** *   * *  ** * *** a[100],b[100],c[100];
** *       *  ** *  ***  ***  *  **  ***** *     ** **  
    int l1,l2,i=0;
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*** **  * * *    **  *     *  * ***
 ** *    *   *  ****  * ** * **     *  * ******  ****   is not a prefix of %s",a,b);
    }
*  *   * *** *** **    *     * *  if(l1<=l2){
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**** * **  * * *  ** * *    **   * *  * **       **   * *  * ** * 
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*** * * ***  *  * *** **** * **   *   ** ** **   ** ***** *    **   ***  ** * *  **  ***   * **** *     *** ****  is not a prefix of %s",a,b);
**   *   *** ***** * * ** *******    *  *     ***** *    **** * **  *   *  *** ***  *** ***** * **  ***** * ** = 0;
***   * **** *  *    ****  *** * ** * **  *  ** ***  *   *** *  * **  **  * ***  * ***  *  * **** **   *  ** *  *  *** 
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* * *******     **  * *****  *  *  **  * * * **  * * *    *      ***    *   *     *** is a prefix of %s",a,b);
**  ** ****  *  * * * ***  **  ** **  ***** *     ****     *
    }
}
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);
               ^
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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
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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)
 *******    ***** **  * **  
* *    ******   * **   * * *  * *  **     * *  **  * * *  ***  *  * *  
  * **  *     **  **    * *    *  * *  *  ***   ** *** **
 *    * * *** *** *  *** *  * * *  ****  * **   *  *    * ***  ****** *   ** **    ****** 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)
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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("");
            ^~
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Case 0: 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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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
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-----------Re-judge-----------
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