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 | 1.9k views

27 Answers

Page:

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

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

char prefix(char s1[], char s2[])
 {
 int i;
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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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** *** ****  * * * ** * *** *  
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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];

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*   *  ** ** * * * *   * **    prefix = 1;

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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]; 
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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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 *   **    * **   * * * * *** *** ***  * **  ** * *    *** *      *   **   * * ** *****    **** is not a prefix of %s",a,b);
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  ****  * ** * * * *   ** *  *   == 1)
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  **  *  ****  *** *  *** *  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(){
** ********   * *******  * *   * 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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