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);
    for(i=0;i<j;i++)
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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;

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

 * *  **      **** **     *  = 0; i < len; i++)
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** * **  *     ** **    **    * ***    *  **  * **  *** != b[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++) 
 *   **** * ** * **** *** * 
*   **  ******  * **  ********  ** *  *** **  ***    != b[i]) 
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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];
  * *** **** * *  *******        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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