1-11 Exercise 3: Prefix of a string

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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 in Chapter 13: Strings by (12.1k points)
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Hidden content!
#include *  **  *  *   *
#include ** * *    ***    

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
 int count=0;
 
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int main(void)
{
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** *    *** ****  * **** * * * *  *    
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**   ***   ** ****  *  *   *    0;
}
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Hidden content!
#include * ** **    *   * *
#include   * ***  **   

int prefix (char st1[],char st2[]){
***** * ***   * ** *  * **     len=0, i, cnt=0;
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*   * *** ** * *  **  *  
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* * *  *     * * * * * *    * *
}

int main(void) {
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 ****  ******* ** *** **  *** ** *
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**  **  * *  *   * ** ** *    ***   * 0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
** *******  *  ** * ** *   **  * ** ** *   *  **
    scanf("%s",b);
    j=strlen(a);
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 **   **     *   **  **  *** ***  ***** **** *  **   




}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
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***   ** * *  * * ** *  ***  *  *  **  **  ***    *** *** **   * **** * **  *  * *

* *      ******  **  **   * * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
 **   * **     ***  ***** *** a[100];

  ***   *  ** **   ****     *  * b[100];

 ****   **    ** * **  * *   **    i = 0;

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

**   *  **  *   *  **** *   *   *     ** ****      a, b);

 ****    * *  *   **** **** *   len = strlen(a);

***   * ***  *    ****   *     * = 0; i < len; i++)
* ****  ** *** * ***** ** ***
 *     * * **** *    * *  * ***  *  *   **** **      *  ** **  != b[i])
**  ** *   ** *   ***  ********** *** ***** **    * *  * **  * 
  *** *****      *     ****** ** *** ** * *** ** ** *********  **  *** * ** * ** *    = 0;

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

   *   ** ** **  * * * *** *  **   * ***  *******  **** *  *****  ******  *   * *** ***** *
** ** **   ** *****  *    * ***  ***  * **   * *** *   * ***
  *****  * * * **  **    *  **
 *** **     ** **   *   ** *  * ** == 1)
   **   * * **   **   * *   *
** * * * ****    *  *  **  ****  ** **   * ***  **  *** *  *** **  * * *  is a prefix of %s", a, b);

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

int main() 
{ 
   **    * * * ** ** * * ** a[100],b[100]; 
*   * **       ***    *     i,j,prefix = 1; 
*     * *      *********      ***   * ** *  %s",a,b); 
  *    * * **  ** ** ***  len = strlen(a); 
*   *   ** **  ** *******  * = 0 ; i < len ; i++) 
  *   *  ** ** *** **  **   
  *  ** *  ** **   *    ** **  *  ** ***       **  *   **** != b[i]) 
  **        * *** ***** * * *    *** * *******  *** ***   
     **  **** *   *  * * *  * ******  ***** ** ******  * ** *** *  **  ***** **  * = 0; 
  ***  *      ***  *  *  *  * *   * ** *  ***   *    ** ** *  ******   ********   * * **    is not a prefix of %s",a,b); 
*  *   **      * * ** * *   **     ******* ** *   * *** ****   **  *    
      *  ***** *** **    ****  *  *** *  *  *  *** *    

***  ***   **  * * *  * *  
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*** ** *   *   * * ****    *   *** *  **   **** * * **** **    ** ***   is a prefix of %s",a,b); 

 
****  *   *   * ** *** *   *****  * 0; 
}
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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'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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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'
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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++)
     *    *** **  **    *   *** 
*   **  ** **   * *   *  *  ***  ** *  **    *  *  ** **  * != b[i])
 **  **    *** * * *   *  * *** **   ****** *    **  *  
   *   ** *** *   *  ***  *  ** ** *   *  **   *** *   *  *** * * ***  ***    * **** *  * = 0;
*    * **  * ****  *   *     * ***   ** *** *   *** *  ***   ****  * ***  * ** * * * ** is not a prefix of %s",a,b);
  *   *      * *   **** *  *   *     *  **   *** *    * **  **       ****    * * *
**    **** *  ****  ** *** ******* **    *  **   *   *

**  * ****     *    ***  * 
  *******       *   ***        ** *  *   == 1)
**   *  *** **** *** *   *   ***** ***             *  **  * ***  is a prefix of %s",a,b);


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