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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 **   ***  ***** ** *** * * * ** *   * * **** **** **** ****  *** * * **   *     *****   ** * * **  * *  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!
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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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* **** **  * * **    * *  ** *****  *   **** **  s);
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 *   ****  * ** *  * ***   *** * *  * *  *   * **** ****    **** **   *   is not a prefix of %s", p, s);
    }
}
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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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    int l1,l2,i=0;
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*****   ** * * *  * ** *    *  * *  * **   * * ***  *   *    * ** is not a prefix of %s",a,b);
    }
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* ** ** *** *      *      * *   ***   *   ** ***   ****** * ***    *   ***** *  * * * *** ** ** **  ******  * **  = 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)
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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
Case 2: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
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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("");
            ^~
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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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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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