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 | 6.5k 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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int main(void)
{
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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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 **** **    * * * *   **    (i=0;i<len;i++)
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*  *   *  * *   ** * * ***    0;
* *  *** *   *** *****
}

int main(void) {
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* ****   * ***      ***  * * *  * *    ******* * **  * * st1);
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*          * *** * * * **  (prefix(st1,st2)){
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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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    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;

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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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   * *      * *  **  *** **  *** * 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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   ** *   **  ** ****  ***  * *    * * ***  **** ***** *** 
 ** ** *     ****** ***     ****** *** ****** * ** * *  *  ******   **** *   * *****  *  ***  = 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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