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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* **  ****** ** *  ***** **    *     ** ** *     
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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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    }
}
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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
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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)
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];
       *  ******   *      ** * * ** ** * **  *    *  * 
* * *   *****      * * * *** 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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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 1: 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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