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()
{
**        * *  ****  **  *   n[999],str[999];
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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()
{

 *  **   **  **    **  a[100],b[100],c[100];
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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
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0 0
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Case 0: Correct output
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Case 2: Correct output
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Hidden content!
#include *   *** *       *  
#include ***  *** ****   *
#include **   **** ****  

int main()
{
 *  *  *  **    *   * ** ** *   *  prefix[100];
 ** **   *  ** * *   * *  word[100];
 *** * ** *   *** ** *    ***  ** *  ** * *    %s", prefix, word);
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  ** **  ** ***  *****  * ***** = 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
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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("");
            ^~
commented by (4.3k points)
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Case 0: Correct output
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Case 2: Correct output
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Hidden content!
#include **  *    ** *****
#include   * * ** ****  

int main(){
 ***** * *  **   ****** **   **   *  p[100],s[100];
* **** * * * *  **  *  ****  * *** *** *****  *  * ** *
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*** * ** **** *******  *  ** * * *    ***** *****  *  **
 ***** *** ***** *** ***** * * * *  **  ** *     ***** ****     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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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
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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