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

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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);
               ^
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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);
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****  ****   *****  *   *  **  * *  * **********  *** * ******   **   *  * *** ** **    ** is not a prefix of %s", prefix, word);
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** * **    ** **** ** * * *   * * ***  * **** ** *   **
    * **   * *  **    * 
*** **  *  *** ***  *  ** *    * *  ** *   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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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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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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