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[])
 {
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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[]){
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*  *  * **  ***  * *   
}

int main(void) {
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}

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];
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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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}

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];

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***   *  *** * ***  ** *  *** prefix = 1;

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** * * * ****  *    **** ** * len = strlen(a);

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* *** ******    *  * * *  
}

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]; 
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 * *       * * **  *  * * *     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++)
 ** ***   *  *** * **  **  *  *
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  * **   * * * ***** *  *   * ****  ** * * ****       *
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** ** * *     *  *   *  ** *   ****   *   ** ****  ****  **   * *  *  * *  **   ** *    *   *  **     is not a prefix of %s",a,b);
****  * *  * ***  **  * * *** **   * *****  ***     *  * *  *****  *  *** **    ** *     **
 *** * *  **    * ** ** *  **  *  * *   ***    *  * 

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