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);
*  **** ** **  *****   **** **     **  *****   **   * **  *  *** *   
 * **** *  *** ****  *    *  * ***     ***** ** **  * *** *    * ** * *  *  *  *   * * * *     is a prefix of %s",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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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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**** *   *   *** **  ****  ****** **  *      **    ** **  *  * ** 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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***** *** * ***    *   *****  * *   ** *** ** *****   ** ** 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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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;
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      ** *******  * **   * * 
**  *    *   *****  * ** * **  *** * ***  **   * 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)
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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 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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