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 | 8.6k 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;
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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[]){
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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);

*****    * * **   *    *** *    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]; 
   * **  ****   *  * * *** i,j,prefix = 1; 
    **   **  *    * *  ** *   **  ** *    * %s",a,b); 
 ****   * *     ** * * * ** len = strlen(a); 
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**     ** *   * * ***   **  ** *   ***   *     * *  
***   ***  ** *  *** **   * *  * * *   ******* *       *** *  ** * ** *** * *   *    ** * * = 0; 
    ****  ** ********** *  * * * *  ****  * ** *****  * * ** *** *  ****  *** ***  *** * * *** * is not a prefix of %s",a,b); 
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 ****   * *    * **  *   ***** ** *  *** ** **  *   * 

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 ***    * * * *  *  ***  * *** **     *  *  *** **   * *       is a prefix of %s",a,b); 

 
 *  *    *  ******    ** * *  *  ***   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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