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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 *******  *   ***  ***** *  ****** * * *** **  ** * 
**** * * * *   ************  **   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)
*  *   * *  is a prefix of ** **     

* *  *  **  *   ****    *** 


}
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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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 *    ***  ***  *  * *  * *   ** *** *     * ** **     *  ***  * is not a prefix of %s", p, s);
    }
}
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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];
***   *   *  * **  *    *  *  * *   ***  * * ***    * **
    int l1,l2,i=0;
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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);
               ^
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];
 * *** **  ** * *  *** **    * *   %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)
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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
Case 1: Correct output
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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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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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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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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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-----------
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Case 1: Correct output
Case 2: Correct output
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