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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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;

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

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