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[])
 {
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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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    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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}

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; 
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 ***     *  *  ** * *** * len = strlen(a); 
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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])
***  ** *  * * ** ***  ** ***  *  * ***   * ** ***  * *  
**  ** *   **   **  *****  **      *  ***       *   ** * *  ** * *** *  ***  ****** * * * = 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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