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 | 9.6k views

27 Answers

Page:

Diyiel · Answer 1 · 2018-01-13 00:58:32

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

char prefix(char s1[], char s2[])
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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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}

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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}

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;

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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() 
{ 
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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];
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 ***  *  *  *** *    ** *  *   *** **  ** %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 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
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 **  ****** ** **   *  *    * *  **** * * * *** **  * *   *
  *  * *  * * **  * *  **  ****   *** ** * * *    *  * **  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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