1-11 Exercise 3: Prefix of a string

Question

12.6k 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 | 12.6k 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;
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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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** *  **   *     ********** 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);

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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]; 
** ** ** * *    * *  * **  **   ** i,j,prefix = 1; 
*  **  * *  *   * * *  *   * * *  *     %s",a,b); 
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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++)
* **  ***  * ******   ****
   * ** * *   * ***  * * * *  ****    * ***  ** * * *  ** *** != 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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