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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** **   *****    ******* *  **     * 0;
}
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Hidden content!
#include * **** ** ***
#include *     *   *** * **

int prefix (char st1[],char st2[]){
 *      *  ***  * *    ***  **** len=0, i, cnt=0;
**      **** *** * ***  *
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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];
* * ***     **** ***  ** * **  **        *** **  *
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    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++)
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*  *   ** *   **  ***** * *  ***   ****  * *   ***** *  *
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 * * * * *  * ********* *******   *  *****  **        * *     *  * ** * *  * ** ***    ****** * *****  is not a prefix of %s", a, b);

     * ** ** *      * * * ** * *  * ***  **  ** *  *    *     *** ***** * *   *** **  **** *
 **   *    * **  *  ** *    *** * *  ** **  *   *    *
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 *** * ***** * * *   *   *** *
*      ** *** *  *  * * **  **  ***** *  * ******   *    *****   *   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]) 
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 *** *    ** **  * *    * * *** ***  *  * ** * *   * * * *    *    ***** ****   * ** = 0; 
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***    ** * * *  *   * ***  **  *  ** 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++)
 *  ****  * ***   *   ******
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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;
}
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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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