1-11 Exercise 3: Prefix of a string

Question

14.3k 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 | 14.3k 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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****    *       * * *  **      **  **
** **  *     *  **      * *  **   *  **  **  **  **  **    == s2[i])
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* ** *  ******      * ** *  * ** * 
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 ****   ********* *  *** *  *  ** 
 
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  *** **  *** * ******** *   ** ** 
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  * *** **  * ** *   * *  **   ***
 return 0;
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 }

int main(void)
{
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 * * **   *   * **** *** * s2[100];
* *  ****   * *** ****** ***  i,j;
  * **   * * **  *    ** **
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** **  * ** *****      ** 
**       **  *  **** ****
*      *  * **** *  **  *** *  0;
}

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;
** **** **  ** **  * * 
****  * * ** ***      * ** ** = (unsigned)strlen(st1);
** **      * **    * *   * 
 *       *** * *  ***  ***** ***  (i=0;i<len;i++)
 * **   * * *** ***  **   
   ****        (st1[i]==st2[i]){
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* * ***** * ** ******* ****     * **    * *  *** * 
        *   * *    ********
*  *  **  *** *** * ***  ** *  (cnt == len){
  ** **** **    * ***  **  * **   ** *  * * ** * **  **  1;
**  *** * *  ***   ** ** *  *
** * * ** *****  * *****   ** 
  *** * *****   ****  **     *  0;
*** *** *  ***     *  ***   
}

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

**    ** *  * ** *     *  * *  (prefix(st1,st2)){
  *** ** *  ** *     ** *      **    *** *       *  *   *   ****  is a prefix of %s", st1, st2);
     * **    ** *  ** * **  *** 
*  * * *   ****     ***  *  ** *
  *    *  * **   ** **   *    *     ** *  * * ***  ******** * *** 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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* **     *   *** *** * * ***** ***   * * * ** * *  * * **** ** * ***           **   **  * **   **   *
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* * **      * * * *   **** * ** * *** **  * ** *** *  ****** *    ** *  * *   *  *
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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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 * *   *  **  *   **   ***** ***   * *  ** *  ***** * ** ***  ** *  *  **      ****  ** *** **    * *       is a prefix of %s",pre,str);
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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);

 *** *   **   * ** ***  * **   *  ** **   *******     **** *  * ***  * ***  *
 ****     ***   **  ** * ****  ** *  ** *  
*  * ****  ** ** * * ** **
* ** **** ** * * **   ***    **   **   == 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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