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));
              ^
commented by (4.3k points)
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Case 0: 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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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()
{

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    }
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***  ***    ** *  * * * ** ****** * *  * ** **     ** *****     **  *  * ******* * *** ** * *  **  *  ** **    = 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
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];
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  *  ***** * ****  * *  ***    *  i;
 ****  * ***  * **      ** * *   = 0; i< strlen(prefix); ++i)
******  *  * * *** *** **  *
****   * **** *** *    *  * *  * **  ****  **  ** *      **
*  *   * * ***   ** **     *** ** ***** *  ****   
* * *  *** *   **  ** ** *** * ******  * *  *           * ** * ***     * ****    *     *  * *   ***** is not a prefix of %s", prefix, word);
***   *** ** *    *    *  ***   **   **** *  ** *** **  * *  * **  *   *  *  ** ** * 0;
**  * * * *** ****   *  *    ** *  *   ** *     ** *** 
    * **** * ****     *   
 * ** ** ** ***     *     *    *    * *     is a prefix of %s", prefix, word);
* *  ***   * * * *  *  *  **  0;
}
answered
edited by
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
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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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
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0 0
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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
Case 2: Wrong output
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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