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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* **  *   *** * *  ***  *  *** ***  ** * * *** * * **
*  ******** *** **   *** **   *   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
Case 1: Correct output
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Hidden content!
* *** ******        
***    ****     **** 

int main()
{
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return 0;

 }


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

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


}
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Case 1: Correct output
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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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***** * * * ** *   *         if(re==1) {
**  * *     *  *    * ****   **   ** **     *   * ******     * is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
0 0
Case 0: Correct output
Case 1: Correct output
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0 0
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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);
    }
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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
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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
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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0 0
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
-----------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.
commented by (4.3k points)
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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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