1-11 Exercise 3: Prefix of a string

Question

1.9k 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 | 1.9k views

27 Answers

Page:

Diyiel · Answer 1 · 2018-01-13 00:58:32

Hidden content!
#include    ** *****  *
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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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}

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()
{
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 *****  *****  ** *  ***** * * b[100];

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

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* * ***  *  **     ***  * * *   **   * ** ** *
  ******* *  **  * **** **  **  * ***   **    ****  **** 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;
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* *  * ** **  *  * ** **** *       * * *   **  *** *
** *  *    * * *    ** *  ** *         **** **  *   *    ** ***** 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;
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  ** ***    *   ** *  ** *   **** **   
*    * * **** *** *  * * ** * * *** **  %s",p,s);
  * **  **  ***  *  ** *  *     **  **
** * *   *  *  *  ***** **     *
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*** *   ** * *******        *   *** *     * * **** * 
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   ***** * * * *  *  **** *  
    **  ****  *     *    * *** ** 
** *  *        *   **   ** **   *  *    ****** * ** * * * **** 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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