1-11 Exercise 3: Prefix of a string

Question

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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 | 9.7k 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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* ** * * *********  * **      ** s2[100];
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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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* ******* ***** * *** *** *   ******* ** *  * *  
* *  ** *   *  *** * * ***** 
** * * ***  *   *    ***      (cnt == len){
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 **   *   * ***  ***    **  *  *
 ***** ** *            *
 * ********   **   *  ***  *  * *  *   0;
*****  ***  **  *** * 
}

int main(void) {
***** *   ** *  **   ** * * * st1[256];
*  * ** * **            **  * ***  st2[256];
* ****  *    *    * **    ** **  ** ******  ** * * *  st1);
****     * *  ***   ***** *     ****   st2);

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* **** ******   *   **   ** 
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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);
    for(i=0;i<j;i++)
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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;

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

*   ****        *  * *  **    **  * **    *** *  *  ****     *   * *** *  *
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****  **   *  **  ******  *
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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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