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);
* ***  * *   ** *  * ** ** *  *** * * ***    ***   * str);
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***    *    ***** *****  * ***  ***  *** ** * ** *   *****      ****    *  ** *  *  *** * *   *** **  is a prefix of %s",n,str);
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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;

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*   ***** ** * * *** ** *  *  *   ** *** *  *** s);
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* ****   **** * * ** *  ****** * ** ** * *  *  ***** *   **  *  is not a prefix of %s", p, s);
    }
}
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

*  * ** *    * *** *   *   * *  a[100],b[100],c[100];
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    int l1,l2,i=0;
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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);
               ^
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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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Hidden content!
#include   ** ** *     * *
#include  *  *  *  **  * 
#include      ** ****  ** *

int main()
{
*  *  * ***** **  ** * *  *** ** ** prefix[100];
**  *** * **  * *** *     *  word[100];
** *    **** **  *    * *         **** * * %s", prefix, word);
*** ** * * ***  **   *  i;
 *   *  *  * ****    **    *** = 0; i< strlen(prefix); ++i)
 **  *     *    * *** **
      ** ** *    * *   *  * ** * *  *  *      * **** *
 *     **     ** ****  * * * ** *** **    * * **
 ** **  * ****  * *  * * *** *   * ** ** *** *  * **** ** * *    ** * **    *   *** ** *      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("");
            ^~
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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("");
            ^~
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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 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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