1-11 Exercise 3: Prefix of a string

Question

13.6k 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 | 13.6k 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;
 int length;
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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[]){
* * * * ***** ** ** **   *   * len=0, i, cnt=0;
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* * *  *  * *  *  ***  ***  = (unsigned)strlen(st1);
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*     ** ***  *** *** * **   0;
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}

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

* ** *  **  *   *  ****   (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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}

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++)
 * ** ***   **  ** *  *  
*  *  *    ** * *** ****   * **   ********  **  * * != b[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); 
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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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