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];
 ** ** * *   * ** *    **  **  * ******** **  * 
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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];

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