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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27 Answers

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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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 *  * *   *   *     * ****** * **      *     ***  **
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}
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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));
              ^
commented by (4.3k points)
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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));
              ^
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
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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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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
* ** * * **  *  *   **   *   ** p[1000],s[1000];
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    }
}
answered by (-120 points)
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Case 0: Correct output
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0 0
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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
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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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**** * ***  ****   * ** * *** **        * *** ***  * * *    *   *  * *       ** 
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* ** * *  * * ** *  * ***** * * ****** *  *  *  **  *  * * ***  **  **  *   *   *  *   * *   * is not a prefix of %s", prefix, word);
 *  ***   **  ** * * **   ****  * * ****    * *     **  *  *     * ***       ***  *  *    * 0;
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   **  * **   * * ** * **   * *
  **** **  ****  **  * **** *****  *  *** 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
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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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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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