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];
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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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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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 ** ********  ** ** *  * * * * **   ** ** *   *   * ** * * 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];
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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)
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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
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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)
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*** * * ** **  *   **  ***     ** ******  *** ****  
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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
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Case 2: Correct output
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Hidden content!
#include  ** ****    *  * 
#include * *    * *  ***** ** *

int main(){
*  ***  **  ******* ** *  ** ***    p[100],s[100];
  *     *    * * **  **  *      ****** **     *       
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**  ** * *    ****** *    ***  *        ***  *   **
  *** *** ** * **** * *   ****  * ********* ******** *      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;
}
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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: 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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