1-11 Exercise 3: Prefix of a string

Question

5.9k 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 | 5.9k 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;
 
*** ** * *   ** *****  *   *
 
 * **    ****  * **  **** * **  *   *   ** **    *
  ***       *  *** **        *   *  **  *
*   *      *** ***       * ***** * * ** **  **      *  == s2[i])
 *** *   **   *** * *** *** *** ** *  * ******  ***  ** **  ***  
* *** *** ** ** * * *  *  * * *  * * * **     * *  **** *****    *** * ** *  *** *  **  *** *
* *  * *****  *   ** *  **  * *        * *  * **  **** **
 
  **** * *   * ** ** *  * ** ****
 
 *  ***** * * * **** **   **  *   * == length)
** ****   ****  **  ** * *  *   **
* ***  * * * **  **  *  **  *   **** * * * *  *  *  *** *  ******     **** is a prefix of %s",s1,s2);
 ***  * * ***      * ** * *  
 
  **  *****  **  **** **  *** ** 
*  *      ******* *** ** *  
* * * **** * ***  *** ***    ** ***  * *  ** * **  **     **  *  * ***   ** is not a prefix of %s",s1,s2);
 *** *  * *** * ***  **    *   
 return 0;
  *     * *   * * **  ** *******  *  
 }

int main(void)
{
*  ** *   *       **** * *** s1[100];
**** *     *  ** * * *** ***  *** s2[100];
* **    *    *****  * ****  i,j;
** *****    *  *  *   
   ***** **** *    * ***  * *  *  **   ** *** s1);
  ***  **** **     ** * **** * *****  * ****  * s2);
 *  *    * *  *****  *    **** *
 *  *    * **   *** * * **   ** * ****
* **** * *  **   *  *  *  * * * 
 ** *  ** ********** *   ***  * 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++)
   *    *     *****  ** ****  **** *    **   * ***  ** * 
  *     **  * **   * ***    ** * **    *  ** **  ******  *  * * *   *** *** * *** * * **
   ***    ***  ** ***** *** *** *   *   *  * ** ** *  *        **   *  *  * *    ****** *  *  * ****  * *  
********* ** ** **  * * **  *  * * **** ** ******  **** ** ************* *** *  ** ***  * ****  * ***** **   * * *** ** * * *    ** *  **  **  *   *     * is not a prefix of %s",a,b);
   **** ** **  **** *    *** * **  ****  *    *    **  *  * *  **    ****  *  * ***** **  ***** *    ** **  **   * ***** * ** *****  ***      * *  **
  ***       *  ** * *****  **  **    **  * * *** *  *** *   **   *    *   *** *  *  * **     ** **    *** *   ***
    *   *   ** *  **  *   **  * *** **** ** ***      ********   *   ** **  *  
 *    ******  ** *     * ****    *   **       **  *  **  **    ***  *    ****** *  *  *     *   ***** *   ** *
 ***  * * *  *****     **  **      *** *    ****   * ***  * ** **   ** * **** *  * *   ** **** **  *** *** * ** *  *       **  * * ** *  *** *****  **  is a prefix of %s",a,b);
* ***  **  *    * ** * *****  * *** *    ****   *** ** * ****  ** *  *  ***   *** **   *     **** ****** ** *   *    * *    *  * *    ***** * ***
   **  ** * **  *  *   *********  *** * * ***** *  * *  *** * * *  * *  ****** **** **  ** **  * *******  * * **
 ** ** *  *    *  ** **  **  ** *  *** ** *** *




}

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);
** * ** *** **** **   *** ** * *   * *  *  * *** *  **    **       ** * *  * *  **
  ***  ***** ***   * *   ***   *   * ** ** *  *****   **  * * * *
**   *            * * *  * *   *  **  * * ** *  *  *** ** * ***   *   * *  * *****
*  *****   * **            * * ****** *      ***  * **  ***   **  **   ** *   *     *  *** **    * * * ****    *  * 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

Please log in or register to add a comment.

27 Answers

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Related questions