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[]){
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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;

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*** *         *  *      *    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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   **  * *  **  **  * ***  ** * ** 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];
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   *  ****   ** ******* *******   * ** *** %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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