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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}

int main(void) {
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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);
    for(i=0;i<j;i++)
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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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* *  ** *     * * *  * * **** *   *    * ***** *  **   *  != b[i])
  *  *  *  *    ****** **   *   **    * * *  ***  * *** **
****  *** * **** *       *  * ** *** * **   **** * *     * ** ****** * ** *  ***  ** ** ***  = 0;

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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]) 
 * ** ***    ***** *** *   ****   **   * ** ****  *** 
* *     *  *     * *** * **   **    * *   *    * ** ** ***  *      *     *** *  * * * = 0; 
     ***** *** * *     *  * **** * ** ****  * * *** * * *    ** *  * *   *  *********   is not a prefix of %s",a,b); 
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 *******  **     *****  **** **  == 1) 
   ** * * ** ***** *********    * * * * *    *   * **   * * ***  *  **  *** 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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0 0
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);
   ***   * * ****      *   *** *    *  ** * *  **** *  * *********    * *  * ** * 
 *** *  *  * ** *  ***** **   *       ******* ** * *

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