1-11 Exercise 3: Prefix of a string

Question

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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 | 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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**   *  * *     *     *   
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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;
****  * * ** ****   **      *
*  ********     *     * *    = (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);
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** * * * ******* * ** ** *     *    **  **          *    ***  is a prefix of %s", st1, st2);
***     *  * ** *  ** 
* * *** *      *  **** **
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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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**  *   ***        * * *** ** ** *    * **  * *   * * *

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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)
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*  **   **   **  *   **   * ** * *   **   **  ***  **   *** * *  *  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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