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

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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];
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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;
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  ****      *  *** ** *
*   **  *  * *  *****   *  ****    * **** 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
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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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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-----------
Case 0: Correct output
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