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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int main(void) {
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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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    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;

 ** *     * *** * * *  * * *  prefix = 1;

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