1-11 Exercise 3: Prefix of a string

Question

1.9k 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 | 1.9k 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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}

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;
* ***   * **  ********   
*   **   **  **** * ****      ** = (unsigned)strlen(st1);
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* *    ****   *   *  *  ** (i=0;i<len;i++)
   **   **    *  ***   * 
* ***   ***   (st1[i]==st2[i]){
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****** * * *   * *** **  *
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*  **  **   *  **** *****  *  **   0;
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}

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

**   *   ** **    *   *    (prefix(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++)
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* *  * ** *   *   **   *    * *  *   **     ***   *  
* **** ** *   *  *       **    ****  *    *  **     * * *** *  ** * * ****  **  = 0;

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

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** *** *      ** * *** * *** == 1)
**** **   *   * **       ***   
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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); 
** * ** ** *  * *** **  * * **  len = strlen(a); 
 *        **    ** ** *** * = 0 ; i < len ; 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 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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