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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   *** *** ** * * * * ** * *  *   *  ***   *   ** *  ** **   **  
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*** *   **** *    *   **       * ***  *   * *  *
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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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Case 1: Correct output
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Hidden content!
 * ***   **   **     *
 * * *****   * ** * ** *

int main()
{
*  ** *   ***   **     ****   * i,plen;
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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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***  *   *  *  * ** **  *
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*     * *   * ** **** * 
** ** ** *  *      ***  ** * **   if(re==1) {
* *    * * ****  *   ***** *  *****  * * ***   **   * * *    **  * 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];
*  *  *       *    * **** * ** **  *   **** ***    **  
    int l1,l2,i=0;
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**  ** ***      **   * ** ** * * ***
** **  *  ** **  *    *** ** * ****   ***   **  ** *   *  *  * is not a prefix of %s",a,b);
    }
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 * * *** *****  *** ******* *  ** * *  ** ** *****      ** *  *  
** * ** ***  ** * *   *   ** *   *** ** ** * * *** *****   **  * ***   *   * ** ***   **   (a[i]!=b[i]){
  *******    * **   * *** ** *   *  **** **    * ***        **      * *** * *       ****** ***** **** ***    ** **   ** is not a prefix of %s",a,b);
* * * *  *      ***   * ** ** ** *  *     ** * * ***    ** ** ***  ** *  * *  * *   **** **** **  *  ** **   *  = 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)
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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
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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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("");
            ^~
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
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
-----------Re-judge-----------
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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
Case 2: 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-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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