1-11 Exercise 3: Prefix of a string

Question

8.7k 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 | 8.7k 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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***     *  * ****  *    **** * 
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*    **     *** *  
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*** *   *  ** *  * * *  * *** ** 0;
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}

int main(void) {
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*   **   * ***** * *  **   * st2[256];
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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]; 
*** *  *  **   *  ****   *   * i,j,prefix = 1; 
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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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