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[]){
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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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}
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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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 ** *   *  * *      ** ****  * = 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]; 
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**  ** **  * * **   *  **  * *   *  *  *** %s",a,b); 
**     * *** *  ** ** ***   ** *  len = strlen(a); 
**  *  *    *** ***    * *  *     = 0 ; i < len ; i++) 
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   *  **** ***  ****  * *  ********   *  *   * ***  ** *** 
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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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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;
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*** ** *  ** * ** *  ** *      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);


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