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);
 ***** * ** ** **    **  ****      *** * * * *****  *     *    * ** *  
 ** * * ** ** ***   *  * ******   * **  *   **    ** *   ***  * *  *  *** ****  ***  *   is a prefix of %s",n,str);
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   **  * *** **** *  * ***   * *  *    *** ***   *** *** **  ** *  ** * ** **      ***  * is not a prefix of %s",n,str);
 *   * ** *  **  * *      * ** *     ** * * ***  *   * * * 
**  **** * *** ******   *      *  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!
***  *****   *** *
  ***   ****   **    *** 

int main()
{
 ** * * ****  * ** * **   i,plen;
    ** *  **   *  * * ** ******   **  **** ****
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* **  *   *  ***
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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;

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

*** ** *** ** * ****  ** * **    * ***** **   {
     ** * *** *   ** * ****  *   * *        *  ** *** **  *  ****  {
  *   ** ** * ****** * *** **** * **  ***  *  *** * * * ** ***  *******   * **** 
*  * ** *  ***  *     **   *   * * *    *   ***  *  ***    *** ** * *  **       *
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 **  * ***** **   ***  * *   ****  {
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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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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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** **  ** * *** * *     * ***   * **
* *******  *   ***    ****  * **** ** *
* ***  * * **  * ** * ** **** *** ***   **  *   *  *  ** **** *** * **  *** is not a prefix of %s",a,b);
    }
* *  *      *  * ***  * if(l1<=l2){
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 **** *  **  * *****   *** * *   **  ** *  ** *   ***     * ***     ***** *  * **  * (a[i]!=b[i]){
** * * **  * *  * *  * *********   ** * ** ** **  **** * **** **   *  ** *** *  *  **   * ** ** * ** **     ** *****  * *  * ******* 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
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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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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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
-----------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: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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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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