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
Case 1: 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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*******     *      ****    ***          **      s);
** *  ****  *** ****  ** * *    

* * *     *  ****  *   *     **  **** * * {
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 * ** **** ****    *   * ** *  * *     ***  *  **  * ** ****  * *** * *  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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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

* *   * * ****  * ** ** ***   ** * a[100],b[100],c[100];
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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)
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);
               ^
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0 0
Case 0: Correct output
Case 1: Correct output
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0 0
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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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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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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;
}
answered by (-323 points)
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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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