1-11 Exercise 3: Prefix of a string

Question

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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 | 5.9k 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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}

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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}

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()
{
 ** **  *   ***     ** **        a[100],b[100];
 ***   *** ** *   ** ****    *** i,j,prefix = 1;
 *** **  ***  *** **    * * * * * **** %s",a,b);
* *   *  ** ****  * *****   len = strlen(a);
 *  * *    ** ** *     * = 0 ; i < len ; i++)
 *  *  **   *   *  *   ***
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* **   **  * *   *  *  ****  **        * * ****  ** * * *
* **    *** * *  *** *** ******  *     ** ****  * *** *  *** * ****  * ** * * * **  = 0;
**** *  **   * ** *** *  * * *****  **  *  **    **  ****** **  * ** *   ** **   *   *** *  * ***    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)
{

   *   *****  *** ** * * *    ********  *****   ******  *
**** **** *    ** * * ****** **    ***  * ***      ***** 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
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 ****   *  *  * **         * ***   * *   * *        ** * ***   *****  * *  **   * ***    ** ***    **     0;
 **  **    *  * *   * * * **   **     *  *  **** *  * * ** 
   *** *** * **  **  ** **   *  *** * ***   ***  * ** * 1;
    }
}

int main(){
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 ***  * * *   *  *  ***  ***  *  * * * %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);
** **   *   ***   ** **   *    * * *
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 **  **  ****  * * *   *** *      ***
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******* ** **   *     ***  *** *** * * **  *  * ****  *  ***** * 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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