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 | 13.7k 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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}

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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}

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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}

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

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;
** *   * * * **     ****        *** **  * 
* *  **** **   ** **  ****    *    * ****** *
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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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