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 0: Correct output
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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Case 0: 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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    }
}
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);
               ^
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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
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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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    * * **  *  *  * * ** *  **   *  ***   *  *     ** ******** *** **    ** **     *     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)
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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];
 **  ****      * *   **  * ***   **  **  
     ******  *  ***** * **  * *  * 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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Case 1: Correct output
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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
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
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Case 1: Correct output
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