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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    }
}
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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)
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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)
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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
edited by
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
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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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;
}
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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
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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