1-11 Exercise 3: Prefix of a string

Question

5.8k 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 | 5.8k 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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****  **   ***  *** ********* *  *    
 
* *         * * *      ** *** * * *    == length)
**  * * * *     ** ***** * *  *** * * 
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  * ****   *  *** * ** * **    * 
 
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****     *  * *  * *    ***
***  **  *  * * ** * *** *  ** * ** ****** **  ** *  *  * *       *** is not a prefix of %s",s1,s2);
** ***  ** * **********     ** *  *** * 
 return 0;
**   * *  * **** *****    * * *** * *  ** 
 }

int main(void)
{
  * *** ****  ****  * * * **  *** ** s1[100];
* * *****   **** *   **** *  * *****  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]){
  *  ****   ** * *  *  * * ***  ** **   * **  *** * ** *  * **** * ** **  **       **  *  *
***** * *    ***** * *  ***  ** ****  ** *  ****     ** ** *** * **
 *     * ** ** *     * *    *  * 
*   ** ****** ** * ****   **** (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;
 ** * *     ***  *  *  *    ** *   ** * * *   **
* ** ***** * *  *   * ******* ** *  *     *  *

  *  * ****    *   **      * * * **  ***  **     **  ** *      **   * *  ** ****  0)
*   ***** * * ** **   * ** * * **    **    *  *  * *  *  *  ** * ** * ***** **
*  *     ** *  * *   * ***  * ** ** * *    *** **   *    **   **  *** *****  ** *** *  ***  *  ******** * is a prefix of %s",pre,str);
   ** ** ****  *** *   ** * **   ***        **   **   **  ** **  ***  **
*** ** **     *       * *  **  *  **  *** * * * ***** **    *
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  * *  ***  *     * ** *** *  *   ***** * **  **** * *****  * ****     ** * * *     **  **   ***** ** **  *** is not a prefix of %s",pre,str);
**       *  * * ******     **   * ** *   *****  * ** * **      ** ** * ** * 

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