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];
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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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    }
}
answered by (-120 points)
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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()
{

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

int main()
{
  **  ** ****  *  *** ** * *** prefix[100];
* ***  ** *** *** ** ***  *   word[100];
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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;
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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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-----------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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