1-11 Exercise 3: Prefix of a string

Question

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 (11.3k points)
Available when: Unlimited - Due to: Unlimited
edited Jan 11, 2018 by semicolon | 212 views

27 Answers

Page:

Diyiel · Answer 1 · 2018-01-12T16:58:32+0000

Hidden content!
#include **  ****  *   ***
#include * * * ** *   * **** 

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
 int count=0;
 
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  ** ***  *** *     ***     *     
 return 0;
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 }

int main(void)
{
   *  *  *   * *** **   ***  **  s1[100];
*** * * * *    **  *  *  * s2[100];
** ******   ** *  *  ** **  **  i,j;
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 * ****  ** * ** **    * * ** 
   *** *   **    ** **     * 0;
}

answered Jan 13, 2018 by Diyiel (-403 points)

Stephen Richards · Answer 2 · 2018-01-12T16:46:20+0000

Hidden content!
#include  ** ** * *** *
#include ****       **   

int prefix (char st1[],char st2[]){
 ** *** * *** * *  *** *** *   *  len=0, i, cnt=0;
    *  ** *** * *  * *   ** *
*** ***** **  * * * ******   = (unsigned)strlen(st1);
 **  *** **   *  **    **   ***
* *****  **       *  *   *  **** (i=0;i<len;i++)
  *** *    *    ****   * *  *
   * ***  *** *  ** * (st1[i]==st2[i]){
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**  ****      * ******  ** ***    *   **   *   ***  ** * 
*  **** *** **     ***** *** *
 *   * *  * ******** **** * (cnt == len){
 *  ***** **** ** * *   **  **  ****** *****   **     * 1;
     ***  *   *  **  * *   ****
 * * *   ***   **   ** ***** 
*    * ** ***    ****** ** **   ** 0;
 ** **** ** * ** **  *** 
}

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

  ***    ** * *  * **   ***   (prefix(st1,st2)){
*    ** ** ** ***      ** ***  * *** * **    ******* ****** *     * ****  * * is a prefix of %s", st1, st2);
**  *** ***  ***    *    
*   * *  ** **  ** * * * * * *
      * * * * *   * *  **  ** ***  ** * * *  * *     *   * *  is not a prefix of %s", st1, st2);

** ***    *      *** *        * 0;
}

answered Jan 13, 2018 by Stephen Richards (323 points)

ryan · Answer 3 · 2018-01-11T14:07:28+0000

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




}

answered Jan 11, 2018 by ryan (-301 points)

Headshake · Answer 4 · 2018-01-11T13:22:34+0000

Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
***** **   *      ***  ***    * * ** * *  *** *      *
*      * **   **    * ***  *   *  **   *     *     

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*     *  **  *  *** *   **      *     **** *** *  * *  * *  **   ***  **  ** *   *  ** * ** **  *  *  ** ***   **   is a prefix of %s",pre,str);
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 ******  * **   **    **  ****  ***** **      ** ***** *  *  * *
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****  *       ***   * * * *  * **   **   **     * ** * * ** *  *****         ***   

 ** * **    * **  * *****    0;
}

answered Jan 11, 2018 by Headshake (-279 points)
edited Jan 13, 2018 by Headshake

Sabrina Lin · Answer 5 · 2018-01-11T13:03:22+0000

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);

*** * **** ***   *  * *  ******      *   * * ***   ** **    ***** *  *  *  * *  *  * 
***   **  * ****  *** * *** **  *   *  ** **  *   ***
* *   * *** *  *  *** *  *  ***
 *  **  *   ** *  * *****    * *  *   == 1)
****   *    *   **    * **
**  **   * **   **** *   * **  *    * ** * *  ****** * *****   * 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 · 2018-01-11T13:00:46+0000

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 (3.8k 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 (3.8k points)

Sammi0208 · Answer 7 · 2018-01-11T13:00:08+0000

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 · 2018-01-11T12:46:02+0000

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 · 2018-01-11T12:28:50+0000

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 (-446 points)
edited Jan 17, 2018 by LinJingYao

VincentXV · Answer 10 · 2018-01-11T12:05:37+0000

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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