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;

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

*   **   *     *  ******* *   *   * **    * *  {
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*  **    * * ********  ****  *** *** *     * ***  **** *   ** * *   *** is not a prefix of %s", p, s);
    }
}
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Case 0: 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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Case 0: Correct output
Case 1: Correct output
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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];
 * ****** ***** * ** *   * 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("");
            ^~
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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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;
 * *  ** * ***  **         **     * *  ** * * *
 * **  *   *   *   **  ** *** * ***   *   **  * * * **     * ** **  * 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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Case 0: Wrong output
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-----------
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Case 1: Correct output
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