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);
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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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Hidden content!
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 * ** ** *  *** * **  * *

int main()
{
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* *   **   *  *** *
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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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***   *  ******* ** ********   * if(re==1) {
* * *     **  *    * ** *  **** ***        * **     * **  *    ** 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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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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**      ** * *    **** * **   * * *   *** *** ** ***   
    int l1,l2,i=0;
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    }
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*  * ***   *****    * ************ ***     ****  * * * *  *  **   * * * * **  * ***  *** *     * * * * ** ** **  is not a prefix of %s",a,b);
** * *  * * ** * * * *  * ** *****    ** **  *  ** * ** * *   **   * *** *  *  ****  *           * *  *  = 0;
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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
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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)
* **    **  **** **  **** *    
*  *          * ***    ****  ** *   *   * * ** * * ** **   ***     **    *** ** 
  ** *  * *   ***    *     ** **** * **   *   **  ** ** 
** ***** * *  * *  ** ***  **  * *  **  *    *    **    * * ******  * **** * **  *  *** ***   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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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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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: 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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