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)
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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;

*   ** **  * *  *  * ** **  ** **   *  * *    p);
*    **  ***     ** ** **   *  * * **** * s);
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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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** **       * **  *  *** ** *** * ** **** *  ****  * **
    }
}
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);
               ^
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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);
               ^
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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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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("");
            ^~
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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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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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Case 0: Correct output
Case 1: Correct output
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-----------Re-judge-----------
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