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];
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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)
*** * * ***  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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*    ****  ** ****  *   *   ** * * * *  * *      **   ** *   **** 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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** *  ***    ***   ** * *   * *  *  **** ***  ***** *  ******* **   **    * **     *** *   *   **    ** *  = 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);
               ^
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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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0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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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)
***** * *      *    *   *
  ** * * **   *** *  ** * *  *      ***  ***  *** * *           ****
 *******   *   *  *** *   **** *  *     ***     *   ***   
 * *    * ** ** **    *     **  * **       *   ** **** ***** *** ***  * ** *****   *  * 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("");
            ^~
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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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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: Correct output
Case 1: Correct output
Case 2: Correct output
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-----------Re-judge-----------
Case 0: Correct output
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