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()
{
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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);
    }
}
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Case 0: Correct output
Case 1: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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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)
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
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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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("");
            ^~
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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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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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