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[])
 {
 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);
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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;

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 **** **** **  **** * *  **  * * len = strlen(a);

     *** ***  * *  *** ** * **** * = 0; i < len; i++)
*** **  ** **  * *** *** 
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*     ** *   * *** *   *   *****  * **  **  *
***    *    * **     * * **  ****** * *   **     *  *   * * **    **        * * * * *** = 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++) 
 ***  * * *** *     **   **  
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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++)
** *    ** *** *   ** * ***  
  *** * ** * * **  * ** **      **** *  ******** * != 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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