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];
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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 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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    }
}
answered by (-120 points)
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Case 0: Correct output
Case 1: Correct output
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0 0
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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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)
0 0
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)
***  * **  ***  *  * *    *
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*  *  *  * * * *** ** ** ** *  * ***********   ***** * *   * * **  **  **  *  *  *** * *    is not a prefix of %s", prefix, word);
* * ** ***  *   ** ******* ******    ******* ***  **  *  ******    ***** ** * * *  *   * 0;
    *       ** * * *    **  * *  *** *   ***    **    **
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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];
 * ****** *** * **  *     *     * * * *      **  **
   ***   **** ** **   * * ** bf=1;
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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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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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-----------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
Case 2: Wrong output
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
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