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 | 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[])
 {
 int i;
 int length;
 int count=0;
 
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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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* *  *  ** *  ***   ** ** **  
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}

int main(void) {
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* ***  *  *  **** * *** **** st2[256];
**** *    ******         * ******   * *   *    * ** * ** ** 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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*** **    ** **** * *  **  * **  ****** * ** * * *  
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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); 
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*     *  ** ***   ** *** **   *** *  ** * **** * *   **   * *  
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  * * *    * *  **  *  ** * **     **     *  ****   *** **  * *** * *        *  *   ***  is not a prefix of %s",a,b); 
*   * *   *** * **   * ****  * ***    ****  ** ***  ***   ***   ******* **    * 
 ***    **   * *   *    **  **   ****  ** * * *  * *  *    *    ** 

 * * *  *  *       *   
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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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