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);
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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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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);
    }
}
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()
{

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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);
               ^
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
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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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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.
commented by (4.3k points)
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Case 0: 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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