1-11 Exercise 3: Prefix of a string

Question

4.3k 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 | 4.3k 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;
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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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* **  ** *    **   *** * *  *   *
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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];
* * **    ***   *      **   *** **  * * *** 
    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++)
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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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 *****   **  **    * *   * *     *** *   %s",a,b); 
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**  ****   **     * * * *** *  ** * = 0 ; i < len ; i++) 
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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])
** **  * **  **   *****     * *  * **     * *     
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*    **  ** *** ** *      **  ** * ** **  * ** *** **  *  ** ****   ****  *** * *    ***   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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