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

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
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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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       ** * * *  **    * *  *    
 * * *** *  *   *     **  * 0;
}
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Hidden content!
#include *   **  *  **  * *
#include * * ** **    * **

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

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

***** *** * *     ***   *  **  (prefix(st1,st2)){
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 ** ** ****     * ** *     **
**  * ** * **** *       * ** * **  *
** **    *** *   **   * **  * * ** * **  ***   ** *  *  *  **  *    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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* **** ****  *   ** *  *   **  ***   ** *** **   **  ** *  **   ** ***  **
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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);

*    * * *   *  *** * * * *** **** *   ** * **** **    **** *   ****  *  ****      **
***** *  *     **  *** ***    ** * * ** *  * ****** * ** * 
* * **  *****  ****** * **    **   
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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]) 
 ***** **    * ** *** *  *  *    * **  **    ***** *   ** 
* **   * *    ****   * * *  *   *  **   * ** ***  **   *  *    * ********** ** *   **  ** = 0; 
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** **   ***  *   *  *** ** *** *** ******   ***   *  ****   * *   *  
 ****    * ** **  * *** *   *     ** * * ** ** * 

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**    * **  **  ** *   *    ** == 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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