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 | 10.8k 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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* *     *    *  **   
}

int main(void) {
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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;

   * **** *   * * *  *  **  *  ** prefix = 1;

****   *  ***  *  * * * *** ** ***   ** *  *  **   a, b);

 **** *     *  * * * ***  ***  len = strlen(a);

*        *   ***** ** ** *** = 0; i < len; i++)
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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]; 
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* *     * * * ***  *  ** * * ***  %s",a,b); 
*  *   * * ***      ** ** ** len = strlen(a); 
****   * * * *  *   **  *  = 0 ; i < len ; i++) 
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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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