1-11 Exercise 3: Prefix of a string

Question

12.9k 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 | 12.9k views

27 Answers

Page:

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

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

char prefix(char s1[], char s2[])
 {
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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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* *** *  **      *   *     * 
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******   * ** ********** * * 
**  *   ** ** ***  ***** **
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**  ***** ***     *   * ** * *
}

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

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

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*    * *** *** ****  ** ** *********    *   * ** **  *    * *   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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