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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27 Answers

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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;

 }


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*  *   ** ***  ** * * ** ****


}
answered by (-336 points)
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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;

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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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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

* *  *   **   * * **  *  * ***     a[100],b[100],c[100];
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    }
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****  *  *** *  **     * **      ****    ** *  *     *   *    **** **** **  * * **  * *  * ** ** * ***** *   *   * ****   *    * 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)
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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
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
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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];
** ****** ** ***** **** ***   **  **   *** ****     * 
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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
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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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Case 0: Wrong output
Case 1: Wrong output
Case 2: 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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