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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}
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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];
 *     * * ****  **     ** *   **** *****
    scanf("%s",b);
    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;

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

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

 ** * ***** * * ****    **   * = 0; i < len; i++)
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 ** **** *   * * ** **  **    * ***    * **   ***     *    ***  *
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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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  *** ****** *** ** * * ***** *   ** * * ***      *** ** ***   **  ****  *****   ** *   ******* is not a prefix of %s",a,b); 
 *** ** **** ** **  ***  *  *   * ** * * ***** *** **  * ** ** *  * ** * *** **  ***   
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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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