1-11 Exercise 3: Prefix of a string

Question

12.3k 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 | 12.3k 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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}

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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}

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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    scanf("%s",b);
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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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}

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() 
{ 
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*  *  *** **   **  *   **   ** i,j,prefix = 1; 
* *  **  *** *  * *  * *   *** **   * %s",a,b); 
**   ** **   ** *** *  * * len = strlen(a); 
* *  *** *** *   *      *  *  = 0 ; i < len ; i++) 
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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++)
   ******** ** **  ** **     **
* ** * * * **** **    ** * ****  * * ** *  * *  ***  *  * *  * != b[i])
  * * * *   **  ****   **   ***  *    *   * ** * 
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* *****  *      * * *   *  * ***    ** *** **  ***    ********   * * *     *    *  ** *  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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