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];
**    ***   *   *  **  * **   *   * *   **   **    
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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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 **  * *      **  **     **      ** * * **   ** ***  ** * 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);
  ** ** *   ********     * *  *** ** * ** * ***  *  * * **   ** * * *****  **    * *  
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**** ** ** **   ** ***      * **
** ** * *   *   **** * *  * *   * == 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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