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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 }

int main(void)
{
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**** *  *** *** ***   ****  s2[100];
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**** **  * ***     ** ** * *
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     * **    *  * * *  * 
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* * **  *   **  *   * 
   **  **  *** **  **   *   *****   0;
}
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Hidden content!
#include  * *   *     
#include  * * *  * ** 

int prefix (char st1[],char st2[]){
   ** **  *    * ** * **  *  len=0, i, cnt=0;
 *  ***  *** *   **   * *     
  * * * * **  * *   *     = (unsigned)strlen(st1);
** ***  ** *  ** **  *
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 * ** *   ****  **     *  ***  * ** 0;
** * *  *    * *  * *   ** * *  
}

int main(void) {
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 *  * ***  ****  * ***    * *  ******    *** * **     ** st1);
    ** *** ** *  * *  * **  ** *   **   ** st2);

 ******* ***  ***  ***  * ** (prefix(st1,st2)){
***  *** **   ***** ** *  * **  * ***           *******  ** **   *** ** *** is a prefix of %s", st1, st2);
****  **   **  *** **   * *
*  ** ****    *  ** * * *  **   
 ******* ***** **   * **   * ***     * *     ** *** * *****   ** is not a prefix of %s", st1, st2);

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

 * **      ** ** *** *******  * * ** *  * ** ******       * ***    * ****  *  *****   ** ** ** * is not a prefix of %s", a, b);

 **    *   *** * * *** * **    ** *** *  *** * *    * ** ***    ** * *  ** * *    
   ** *   * *   *   *   ** * ***   * ** * ** *  
     ***  ** * *   ****        
** **    *** **  *  **    * ***** * ** == 1)
**  ******* * *    *
  **  *  * *   **     *  ****  * **  * ** **   **  *   * **   *** 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]) 
  * ** **   *** *     * ** *  *   ****  ** * *****  
*  ***   ****** * **  *    ** *   *    **  ***  *   *********  **  **** **  = 0; 
*****  * *   * *   **  *  *******  **   *  **  *   ** **    *  * * ******* * ****  **   * is not a prefix of %s",a,b); 
*   * * ***   *  ** *    ** ***  *   ** ***   ******** *    *** *  *   ** ** ** 
  *  * **** *   *    *  *  * * * **    **    ***   

 ****       **   *  * *******  
**** * ** *   ** *   *** *     ** * == 1) 
 ** *  *** ******* *     **  *    ***     *   ** *****   **   ** 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);
*  *          ******** ****    * *** * ** *** * *  ** * *** * *****   * ****   **  **
******   *  *  ***  **  * * *** ** * *** *  * *** **    

*** **** *      *** ** *  *
  **   ****         * **  * *   * == 1)
*  * **    * * * ********  * * *  ** * ****  ****  *  *   ** * **  *** * * 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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