1-11 Exercise 3: Prefix of a string

Question

8.7k views

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 Jan 11, 2018 in Chapter 13: Strings by thopd (12.1k points)
ID: 41439 - Available when: Unlimited - Due to: Unlimited
edited Jan 11, 2018 by semicolon | 8.7k views

27 Answers

Page:

Diyiel · Answer 1 · 2018-01-13 00:58:32

Hidden content!
#include      **** **  
#include  * **   * ********

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
 int count=0;
 
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int main(void)
{
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}

answered Jan 13, 2018 by Diyiel (-193 points)

Stephen Richards · Answer 2 · 2018-01-13 00:46:20

Hidden content!
#include *    *  *  ** *
#include * *  ** * * *    *

int prefix (char st1[],char st2[]){
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 * *** * *   *      **** ** 
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*  **** *      **  ****      (i=0;i<len;i++)
***  * *   ****  * * * 
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*  * * ** * * *       * *  * * 
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 ****    *  * *   * * *****
* *   * *  ***  * * *  *  ***
** * * *  ***  * * **** *     0;
**   ** ***  ********  * * 
}

int main(void) {
   *** * * **  * **  *   * * *  * st1[256];
 ***   * * ** ** * * ****    * **  st2[256];
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***   ** *  * **   ** *  ** *  * **  ***  *  st2);

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  ** ** **  *    ** *  **  *  ** *   ****        **    * is a prefix of %s", st1, st2);
  *   *** * * **  ***  ***   
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}

answered Jan 13, 2018 by Stephen Richards (323 points)

ryan · Answer 3 · 2018-01-11 22:07:28

Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
 ***    ******  *** ** *     * * **  *  *** *****  *  * 
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}

answered Jan 11, 2018 by ryan (-301 points)

Headshake · Answer 4 · 2018-01-11 21:22:34

Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
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**  *      *   * * * * * ** *   0;
}

answered Jan 11, 2018 by Headshake (-281 points)
edited Jan 13, 2018 by Headshake

Sabrina Lin · Answer 5 · 2018-01-11 21:03:22

Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
**    * ******  * * *** ** *  a[100];

* ***  *  *  * * **     *  ** b[100];

*        **   *****  * * i = 0;

   **   ** *****  ** * ** * *  prefix = 1;

   ** * *  ****   **** ***   *   * *  *  * ** ****  *  a, b);

* *      ****  *    *  *    * **   len = strlen(a);

 * ***  * **  * * ******** * * **  = 0; i < len; i++)
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**  *** *  ***** **     ***  
}

answered Jan 11, 2018 by Sabrina Lin (-285 points)
edited Jan 11, 2018 by Sabrina Lin

watty1998871108 · Answer 6 · 2018-01-11 21:00:46

Hidden content!
#include   **** **  *      
#include * ** * **   * 

int main() 
{ 
* **   **  **  *     ***    a[100],b[100]; 
   ** * **     *   ****    i,j,prefix = 1; 
**    * ** **  ****  *  * ***** ** * *  %s",a,b); 
* *  *******    * ** ***   len = strlen(a); 
*  *****  ***   **     *** *    = 0 ; i < len ; i++) 
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 *     **  ** ***** *      *      *  * **  ***  ***   ** 
*  ** * * *  * ** *** ***   * * * * * *     **** ** **   ** **    *  ** * *  **      = 0; 
 **   *  *   **   ** ***  * ***  ***  * * * *  * * *****  ** *** ***** **** *  * *** **  *** *  * is not a prefix of %s",a,b); 
 ** * *  * * ** * **  * *  **** * *  ***  *   *  *      *       * * ****  *  *    
**       *  ****  **  ** **   **  **   ** * **  * ** 

 **** *     ****  **** * * * *** 
 ** * ******    *  * * *   *** == 1) 
*     * *** **     *   *  **   ****  *** **   * ** *  * **  ****** is a prefix of %s",a,b); 

 
  *  **          *  ****   *   **  0; 
}

answered Jan 11, 2018 by watty1998871108 (-127 points)
edited Jan 17, 2018 by watty1998871108

prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'

commented Jan 17, 2018 by The Judge (4.3k points)

prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'

commented Jan 17, 2018 by The Judge (4.3k points)

Sammi0208 · Answer 7 · 2018-01-11 21:00:08

Hidden content!
#include <stdio.h>
#include *  *** **** *    
#include ****** * **  * 

int main()
{
 *  *  *** *    ********  * ** a[100],b[100];
 ******  ****    **   * i,j,prefix = 1;
***   *    *   ****  *  ***   *****      %s",a,b);
*  *   **  ***    **      * len = strlen(a);
*   ****    *  **    *** ** = 0 ; i < len ; i++)
** ***** **   *** **  *    ** **  
  ** *** ***  *     * * *   ***** ***   ** * *     *  *   * *** != b[i])
** *    ***  ****** * ** * * *  *  ** *  **  **  **  
 **   **      **  ***   ***** *****  *    * **** * *   **  **  ****  **     **  **  *** = 0;
 *  ** *   * ***  *    * ***  ***  ** ***** *  *   *    *** * * ** ***  * * * * *  ** * * is not a prefix of %s",a,b);
 ** ** * ****  *  * *** ***  *  * *   ********  *    * * *  *      *  *   * ** * * ****
  *  *** *** * * ********  ***  ***  ** *  * ****  * 

** * * *** * *** ** * **  **
* * ***** *****  * *   * **       == 1)
    * *  *   *   **    *  *** * ** *      ***  *** *** ***  * *** is a prefix of %s",a,b);


*   *******    * **  * *     *     0;
}

answered Jan 11, 2018 by Sammi0208 (-255 points)
edited Jan 11, 2018 by Sammi0208

410530022 · Answer 8 · 2018-01-11 20:46:02

Hidden content!
#include  * ** **       * 
#include * ** *  ***  *  *

int prefix(const char *pre, const char *str)
{

  ** *  *     *** ***  **   **   *  ** * * *
* ***   *  * *   ****     *   ** * **  **  **  **** **  **  0;
 * * *  * * *** ****** * *****  * ** * *** ***  **   
* ** * *   *  *** ** *  * *    ** **  * *    * **  * ***** 1;
**     **     *   * ****** *** return 0;


}

int main()
{
 * *   * *  * *   ******** *   pre[100],str[100];
* *  * * *  *  * ** 
   * ** *  * ** *      *   *          *  ***     * ** 
** * *  **  * *   **  * *      **   * **  
* *  *  *  *   **** * *  ** *    **       * **  ** * **   **  is a prefix of %s",pre,str);
 * *  ******   ** ** ******  **
   *    ***  ** * ** ****** **  ** ***   ** *     ** ***** **** *     is not a prefix of %s",pre,str);
 *     **   ** ***   *   * ** 0;
}

answered Jan 11, 2018 by 410530022 (-196 points)
edited Jan 11, 2018 by 410530022

LinJingYao · Answer 9 · 2018-01-11 20:28:50

Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
**   ** *** **** **      **** * c;
** ** *  * *  ** *** *  *   *  * *  *     ** 
   *** ***  ** *  **  ** **  ** ***** ** ***   * ***  0;
  ****   ******* ***  **  *
  ** ***** *** * * * ** * ** *
*   *   *** **** *** *   *  *  *  *    **   ** ** *   * * **** * ** * *  * ** *  of a string
  ***** *** * *****   * ** * ****    ** **       *** ****  ** ******* ** * *  *  *    ** 
 * *  **  *     * *** *  **    ** **** ** * ****  * * *  *** ** *    ****    * **   ** ***** *    ** ** * 0;
** * *  *   * * **** * **   *         * *  *  * *   * *** *
****    ** * *** ******  * * * **  * * **  ** ** ** * 1;
    }
}

int main(){
  ****   **  *  *    *  a[100],b[100];
      * ** *    ** ***  **    **  ** %s",a,b);
* * *  ***   ** *   * **     **  **   **
**   *   *  ******   *  ** * ** *  ***** ** * ** * * ***  *  is a prefix of %s",a,b);
     ****     * **   * **   
*    *  *     * **** **   **** * * * *     * ****  *    ****** ** **** * * is not a prefix of %s",a,b);
*   **   * *    * *  ** ** ** *  ** 0;
}

answered Jan 11, 2018 by LinJingYao (-498 points)
edited Jan 17, 2018 by LinJingYao

VincentXV · Answer 10 · 2018-01-11 20:05:37

Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
***  **  ***  * *   ** **  * **   p[100],s[100],a[100]={};
****  **** **  * ****    ****  * t;
*  ***  **  ***  *    ***  *    *     * **   
 * * * **   *** *****   ** ** *  **  ** ***
  * * ***       * ***  **   * ** *  **  %s",p,s);
   * * ** ** *** ** ** * * ** **  *******
*  **   ** ***  * ****** ** **** * 
***  *   * *    *   ** *** *  * * *     
**   * ** * ** *****  **  ** ** *** *   *  
   ***** ****  ** ** **** **** ** * *
  * ** **   ** **   **** * ** **  ***  ***** *  ** *  *  ***** *   is a prefix of %s",p,s);
**    ** *******  *  ***  
 *  * *  * *** *****   * **
 * ** ***  *    *  **** * *    ***** **    * *  * * *  * * * *  *   is not a prefix of %s",p,s);
* *** * *      ***  ****** 
 *** *****  ** ***  * ** ** **  0;
}

answered Jan 11, 2018 by VincentXV (54 points)

1-11 Exercise 3: Prefix of a string

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