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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}

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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);
    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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 *  *  ***  **   **  ***** **   ******  **  * * *   * * *** * **   ** * ***  ***  * **

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