1-11 Exercise 3: Prefix of a string

Question

13.7k 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 | 13.7k 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;
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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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      * *** **  *  *** *
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*** *  *  **   **      ****   
***    *   * * *   *  *
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 **    *  ** ****  * ******* * 
}

int main(void) {
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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];
**   *  ** *****   * *** * *    *** *  ***  ****
    scanf("%s",b);
    j=strlen(a);
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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); 
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* *** * * ****  * * *  *** ** = 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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