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

 

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Hidden content!
#include   *   ***  ***  *
#include  *   * * *******

char prefix(char s1[], char s2[])
 {
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Hidden content!
#include    *   *   ******
#include **** ****** **  

int prefix (char st1[],char st2[]){
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}
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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];

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* * *  * * * *  *   ****  *  * 
}
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Hidden content!
#include *   * *  *  
#include   *** ***  **** *  

int main() 
{ 
*    * * ***    * *  *  ***   *  a[100],b[100]; 
  ** ** *  **  * * ***** *  i,j,prefix = 1; 
*     **   *** *  * *  * * *   *** **** %s",a,b); 
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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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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];
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 *  *    *  ** *    *     * * * = 0 ; i < len ; i++)
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 ** * *  *  ** **  *** *    ** ** **  **    * ****    *** != 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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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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