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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***   * *  *    *****     ** * *** *** *   *   *  ** **** * * *** ** * ********  **   **   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!
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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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Case 2: 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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    }
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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)
    *** * * ** * *  * **    *****
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      * *  *  * *  ***  *  *   ***** *  * **** *   ** 
**   * *  *   ****** *  * *     *  **  * **  ** * * *** *    ****   **  **   **** ** *** 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
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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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0 0
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-----------
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