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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}
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Hidden content!
#include **  *** **  *** 
#include  **     **   

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

int main(void) {
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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;

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* ****   ****        * *     ****  *   * **** *  * a, b);

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

 *  * ** *** * **  **  * = 0; i < len; i++)
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****   ****  ** * * *
}
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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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*    ** * * *    **  **  ** **  ***  * *   * * * *****   
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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++)
** * *  * **  **    ** * 
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 ** *  *** * *****    *    ** * *** ** **  ***** *  * 
** * *    **        * * *  *****   **  *  *   **** **   * * * *   ** *   *** * *  *   = 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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