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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{
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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];
 ***  * * *  ****  *     ** **** ** * *    *   *  
    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);

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  * * *** ** ** * ***     ** * * = 0; i < len; i++)
  **     **   *    **** *
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 *  * *** ** *** *  **** ** ** **** *   **** *** *** *
*** * ** *  **** *  ** * ******  ****** *       * *  ****   *  **  **   ** **  = 0;

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