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 | 1.9k 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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{
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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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** *   * ****    *  *   *** * *** * 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);

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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; 
}

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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