1-11 Exercise 3: Prefix of a string

Question

12.3k 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 | 12.3k 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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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;
* *****   **  *  *** *** * 
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*     **   * * *** * * * *
* * * *    **   *****        (i=0;i<len;i++)
 *   *****  *** * *    
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***   ***  ** ***  ** *
}

int main(void) {
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* *** *** ***    **   * **  st2[256];
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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);
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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++)
 * *    * ** *   *    *  *
***  * *   *** *   *  *** * ** *  * ***  *  *   * ** **** != b[i])
  *** * * ***  * ** ** **     **** **     ** ** ****    
 * **** *  ***  **** ***  *   ** * **  *  *   *  * * * *** *   * * *  * *       = 0;

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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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