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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 * **  **  *   *  * * *  ** *    ** **  ** **** * * ** ****
   * **** *     ***  *  * * **   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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Case 0: 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;

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 ***  ** ** ***  ** *  *  **  **    * *** * ** *   *   *    * * *   ** *  is not a prefix of %s", p, s);
    }
}
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Case 0: 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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    }
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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
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0 0
-----------Re-judge-----------
Case 0: 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)
***  * * * *  *   * ***  **   
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* ***** *  *         **  ***** **  **    * *  
** *    * ** * *  ***   ** * ** * ******* ** * ** *  ****    * * *     *      **    *** **  * 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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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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