1-11 Exercise 3: Prefix of a string

Question

6.2k 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 | 6.2k 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;
 int count=0;
 
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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;
 ***   ******  * * ** ***  
 * ****  *  *  **   *  = (unsigned)strlen(st1);
*  *** * ******    * * **
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 *  **   *******    ***  
 *     ****  ***  ** (st1[i]==st2[i]){
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  **    **  * ***    * ** **
**  **     * **   ***** ****  (cnt == len){
*  * ** **   *  ** *** *** *      * *** **** ***    1;
**    * ** ** ******     * *
 * * *      ***  *** ** ***  *
   * * * * **    *  ** *   **  0;
 **  ** *  *  * * **   * *** **
}

int main(void) {
  * * * ** **  * *   * ** st1[256];
    *    *  *  ******  **    st2[256];
** *** ***** *     *******   ** *   *   *****  ****   * ** st1);
**** ** * ***    * **       **  ** **  **  * *  * st2);

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***  * *** ****  *  * *  *        * ****   *** *   ***  **** **** is a prefix of %s", st1, st2);
*  * *** * * ** ***** ** * * * 
 ** **   **   ***    * * **** * 
*   * *   *** *   * *    ***     *  ***** *  ***  ***  * * *    is not a prefix of %s", st1, st2);

  * **** *  **** *  *  *  * * **   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];
      * *      ******  **** *   *  * *  *  
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
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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])
*** *  ** ***  * * * * **    * **   **  ***  *
 *   ****** *  **  *******  *******  ***  **  * * *  * *  *    **    * ***         * = 0;

  **  ** **** *   ** ***    **  * * * *  * * * *   *      *  * **   **  *  *     * *****  *  *  * is not a prefix of %s", a, b);

 *  * ***  ** ** * ** ****  * **    *  *****  * * *** ***  **** ***   ** *  **      *
*  *    * ***  * * * * *  ** * ***  *   *    ***  * **   *
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** *       * *   ** *   ***    *   == 1)
****  **********  ** * **  ** *
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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); 
* ***     * *****  *  *** * = 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 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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