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];
* **   ****  ***  *****   *      *  **  ***  n);
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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)
***     * *   is a prefix of    **  *  

  **    *  ** ** *** * *** 


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

int main() {
  *** * ****  * ******  ***  *  p[1000],s[1000];
 ***  ** ****   *  **  * *** i=0,re=0,len;

 **  *  ** **         * **   ** ** * *** * * ** ***  p);
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***  ** ***** * **    ***   *** * *

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  **** **   **   *   **  ******   ** ** *  ******** *  **  *   *****   ** is not a prefix of %s", p, s);
    }
}
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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    }
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  *  **  ***   * ** * **     **  *  * * ** ** *   * * * *** *****  **   * ***** ***  ** ** ** ***    = 0;
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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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*  **   ***    *  **    ***** *  * ***  ***** **  * *  ** * ****
  ******  ***     ** * **      ** ***  **  * ****** ** * *    *  * * **     ** * *   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)
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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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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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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 1: Wrong output
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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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