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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Case 1: Correct output
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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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Case 2: Correct output
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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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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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    }
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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
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("");
            ^~
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
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'
commented by (4.3k points)
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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.
commented by (4.3k points)
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Case 0: Wrong output
Case 1: Wrong output
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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
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