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);
*  **** *** ** * ***  *   * * * * *   **  *  **   *  *** ***  **     *
*  **** ** * ** * *** *   **  **  **    **   * *     *** *  * ****  * *  ** * * * * ***  ** * is a prefix of %s",n,str);
 *  * ** * *  **** *** *  **  **  **    **      **   *  * *
*  ** **  *    * **** ***  *** **  *   *  ** ** ***  ** 
   **** *   * * *  *    ****         *    ** ** *   ******  ** *   ***** *  **  *     is not a prefix of %s",n,str);
 **   ****   *****     *   ** ********   **** ** *** *
****   * *  ***   * *       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 0: Correct output
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Hidden content!
****  * **    *   ***    
 * *    ** ******  *  

int main()
{
  ** ** * ********      * * ** i,plen;
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* * *     *** *    * *      ****

  ***  **     ***   
**** ** *
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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);
    *   **      * * **  ********  ***

 *** ** * * ***** **  * *   *    *   **  {
** ***** **   *  **** * ****    * ****  **  ** * *    ** *  * * {
*** * *  ***  *  **  *   ** *** *  ** **   **  ** *  ****  **   *      ****   **  ***    
*** *  ** ** * *  ** *      * **** *   *****   ** **   **** *** **   ****    *         
*  **   ** ******* * *  ** *  * **   *   ***   * ** ** 
***   **  ** * **** **  * **
* *** * ** *  *   ****** ** *  *****  ** {
***     *** *  *  **  *   * **** *** *  **  *** * *** *** * * **  is a prefix of %s", p, s);
**  *    *** * **       
  ** *    ** * ***** * ****** * if(re==1) {
** *  ****   ** *   * * ** * *** ** ** * *  * * ****** *      *****  is not a prefix of %s", p, s);
    }
}
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Case 0: Correct output
Case 1: Correct output
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0 0
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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);
    }
* *  * ** *    * *  ***    *  *   if(l1<=l2){
 * * ** *** * *   *****      ************ * *  *** *** prefix = 1;
*   ****  * **       * ***** * ** ***  * *    ** * *** *  * 
 **** *  **     *** ***      *** * *   * * * *** **  * * *  * *** *  **** * *    (a[i]!=b[i]){
 ** *  **** *  **** *   *    **  *    **    ***  **  ** *  **  *    ***  **   *  **   ***      ***  **    **  is not a prefix of %s",a,b);
 **  * * *  * * * * *** *** **  *** * * * *  * *   ** *** **   *** **    **      ***   ** *** *  * *   **    ** = 0;
  **** **   * ** *  **** * **  *  *   *****  *  * * *   *  *** ******      *** ** ****** * ***     ***  * * * 
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**** * * **  * ** *  ******   ****   * **  ***
  * *   *** *     *   **    * **  *   **   ** *  ***   ** * * **  == 1){
  *    *  *** *  *** * * *   *       **** *** ********* *  *    * * ***  ** **** * ** *** *   **  is a prefix of %s",a,b);
 *** ***  ***   * ****  * *** ** * * **   *    * *  * ** *    
    }
}
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
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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
edited by
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)
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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Case 0: Correct output
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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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0 0
Case 0: Wrong output
Case 1: 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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