1-11 Exercise 3: Prefix of a string

Question

10.9k 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 | 10.9k 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;
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{
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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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*  * *****   *   *  ***  
* *    * ** *** ** **      * 0;
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}

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

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

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

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