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