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 | 11k 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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int main(void)
{
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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){
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        ***      * ****    *
*** **   **  *  * *   *  *  
**  ** *  * * * ****  *** * 0;
**** ** **  *******     ** *    
}

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

* ** **  * **   * **  *       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++)
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  ** ** *  ***     *** ***** *     *** *  * **** ** * * != b[i])
*** *  *   ***** *  *  * * **  *  **   ***  ******* 
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**   * **  * ** *  * * * *** * ******* == 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); 
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   *  ** * *  **** * * *** ** *** ***** **   **      *   

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