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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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
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*****    *    **     **** *  *  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()
{

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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
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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];
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  ** ** **  ***** * * ***   ** * **    %s", prefix, word);
****** ***  * ********  *** **  i;
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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("");
            ^~
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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
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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-----------
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Case 1: Correct output
Case 2: Correct output
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