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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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];

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

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*  * * ** * *   ** *      *   **     = 0; i < len; i++)
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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++) 
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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++)
   *  *   * **  ** **     *
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*** * ** * *  **  *** **  **       * ***   *  * **  ** *
** * * ** * *   *   ** ** **    * ***   ** * ** ** * * *  *  *******     * *  * ***  = 0;
*  **      **      **  *** ** *  ** ***** *    **     **   * * *      **  *****  * *  *   ** is not a prefix of %s",a,b);
***   **    **   * * *   *  ******    *    ****  *  *** **   ****  *   * * *   ***  **  **
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 *  *  *   ** * **   *    *** 
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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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