1-11 Exercise 3: Prefix of a string

Question

7.5k 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 | 7.5k 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[]){
    **   * ****   *   * *  ** len=0, i, cnt=0;
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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);

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