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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**  * * ** ** ** *   ** *** **** **   * **   ** *        *  ** *  **   * *******   **   ** * 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()
{
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******* *   *  *  *** ** ** *   *   ** * 
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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;

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

** *   *** *   * *  ** ***     ******  {
 ** *   **   ***  * *** *  ** **** *  ** * *  **  *     ****  {
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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);
    }
 ***      *** *  ******** * * if(l1<=l2){
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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)
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
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)
*    ** * **   ****** **
*** * *** **  ** *  *  *** *** ** ********** *  *** **  *  ***
**  ** * *  * *   *  **** ** *** ** ****  * * * *** 
***** ****        * * **      **   ** *   *  *** * *     **   *  * **  * *    *     *    **  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)
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
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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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0 0
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;
}
answered by (-323 points)
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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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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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