1-11 Exercise 3: Prefix of a string

Question

13.3k 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 | 13.3k 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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* **   ** ***  ****  * ** * 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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}

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;

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***    *  * **  * *  * ** **  **   ** ** **   ** * 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() 
{ 
** ***   *    * *  ** ***   a[100],b[100]; 
*     ***     *  * *** *  **    i,j,prefix = 1; 
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* *** **   * *  * * * ** **  * 
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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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