1-11 Exercise 3: Prefix of a string

Question

6.5k 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 | 6.5k 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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***  *   * * *  *     ****  ** * s2[100];
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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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** **    *  *****    * * ***  
*   ** ***** * *  ***  * ** * (i=0;i<len;i++)
*  *  *    ** *   *** 
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*   ****  *** *     ** *   ****  *   * ******* *    
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** *  **   * ** * * ** ** * * (cnt == len){
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* *****  *   *      * *   **
***   *           *  *  *  
*      *****     * *      0;
*****  * ** *  *  ** * ***
}

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

* *  ***   *    **  **** ***  (prefix(st1,st2)){
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  * **   *** * ***** *
 ******  ***  *** ***  ** **   *  
***** *** ** *   ** *      * ** *   *  * ** ****       ***   *      ** ** is not a prefix of %s", st1, st2);

   * ***  * ** ** ****  ***  ** 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;

*** *** ** *  ****** ** **   * * * * * * * *    *** **         * * ****  ** ** *** *    ** *** *     is not a prefix of %s", a, b);

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

*  ***   * *** * **      *
}

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++) 
* **  *** **   *    **    *  
 ***  *    ** ***   * ***   * **  *** **      ** * != 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 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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