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);
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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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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) {
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    }
}
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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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  ** *  **    * **    * ***   *     *  ****   * ** ***  ***   *     ***   *** **    **** * ***   *** *** ****     ** ** **  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);
               ^
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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);
               ^
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
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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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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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