1-11 Exercise 3: Prefix of a string

Question

6.5k 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 | 6.5k 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){
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*** ** * **      * *    ** *
 *  *** * * *** *******  * 
 * * *** *   * **     * *   **  * 0;
*   **     *     *  *  *****
}

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

* *   * *   *      * ** *  (prefix(st1,st2)){
* ** *    *****  * *  *** *    * ** ***  ******* **     is a prefix of %s", 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];
*      ** *** **     *   *  *** *    * * *  ** ***  
    scanf("%s",b);
    j=strlen(a);
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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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***  *   *  *  *** * *  **
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  * * ****  **  * ** *   ** **  ******  ****** * **     ****     **** * *  is a prefix of %s", a, b);

 *      ** * * * *    
}

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); 
 *      *** ** **     * **  ******    * * ***** * ** *   ***   ****  *   *   *  *  * ** * 
    **** *  ** * * ***  *  ** ***  * * *    * *  * ***   

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**   * ** ****  ******** * **  * * == 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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