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];
* ** *** **** *** **  ***  ***    ** **  *** n);
**** ** *  * **    *  * **   *** *     ** str);
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 *   ***** *  *  *** * * *  *    * ** *  ***  ** *     * *  *        **  ***  *   **  **    is a prefix of %s",n,str);
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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;

 * **  ***  *   ** ** *  *   * ** *  *   ** ***  p);
 ** * *   * *   * *** * **   *    ** * *  *   **  ** s);
 *  ******  ***    *** ****   *  * * * 

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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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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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    int l1,l2,i=0;
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   *   *  ** ** **** *   * ***   * **      *
*****  ** * ** ***   **          ****** * *** *  * ** *  *       *  is not a prefix of %s",a,b);
    }
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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
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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);
 *  ***  **    **  ***  * ***   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
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];
*    * **   * * **  *   *** * * ** ** *   *     ** *
 *  * **     *    *  * *     ****  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'
commented by (4.3k points)
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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-----------
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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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0 0
Case 0: Wrong output
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
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