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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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];
 *  **  * * ****   *  ****  *    *** *  **** ** **  *
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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];

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

*  * **  **  ** *** *      ** 
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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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