1-11 Exercise 3: Prefix of a string

Question

1.9k 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 | 1.9k 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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**  *  ************  **  **** *
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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[]){
 ** * *   *  *   ****   ****   len=0, i, cnt=0;
 ****  *     ** * *   *   *****
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 *** *   *****  * * ** **  ** *
   **  *** ****   * * *** ** 
  * * * *    ** * ** * * * **   ** 0;
*  ***  * * ** * ** * **
}

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

* *  *  **  *   * * * ** (prefix(st1,st2)){
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 ** * ****    **    * **  *
  ** *   ** **   * *  ***  * 
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 ***   *     **       ** **  0;
}

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];
** **    ** * * * **  ***  ** * ** ***  *    * ** **    **
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
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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++)
 *****  *     *  **   *     *
 *** *   ** ***  ***       ****   *** * **    ** ****    != b[i])
** *  ** ** ****   ** **  ****  * **  *    *  *   *   *   ***  
****** *  ****  *******  *   *  ** * ***   ** * *   *  **  * ** *** * *** *    *    = 0;

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*     ****  **  ***   *  *** ** *  **  *  **  ** * * *  **  *   *  *  ** **** ***
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*     ** **   * * * **  **
* *    ********** *** ** *** * == 1)
***** **    *** *   ** *     
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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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