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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*  ****   **  ****   * * ** *  ****  0;
}
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Hidden content!
#include   ** * * *    *
#include  **  *****  **  *

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