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 | 14.8k 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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** **   *   *  ** ** *****    * 0;
}

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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*    * *** *  **  * *    
}

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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**** *   * ** * *  * ***   *     ****  * ** * * **** * * **     * ** **  *   * *    *  * * 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
       * **** *****  *   ** ** * ** ** ***  **  ***** * *******     * ******* * * *  *  *  ***** 
 * ****   ***** ** * * *  *    * ** *   * *  *  ***  * **    ***** **         *** ***  **    **  ***  * *** 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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