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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}

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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];

   ***   *** *   **  ** *     *** i = 0;

 **** * ******  *  ***    *  ** prefix = 1;

 * ******** **   *** ******   *** ** *****     * a, b);

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

*  * *** * **   *** *  ***   = 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]; 
****   **  ***  ***  * ****   i,j,prefix = 1; 
*  **  **  *  ****     * **  *    ** **     %s",a,b); 
 * ** **  ** *  *   * ** len = strlen(a); 
   ***** *   * *  *    ****    = 0 ; i < len ; i++) 
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**    * *    ** ***  * * * *  ***  * *  *****   
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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])
   * ** **  *  **  **** ** *  ** **  ***  ** *** *
* ** **  * *  * ***  *  **  **      *** *          ** ** *** *     ****   * *  **  = 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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