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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 **** * ** ** ****  **  ***  **** * 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];

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*   *** **  *** *  * *       ****   ******** ***** ** * * 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++)
   *  * *****     ***  *  
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* ***      **  *  *  *****  ***  * **** ****  ** **
  **  *   *   * **** * ********  *** **       **  ***   ***  ******* * *  * *** *** * * **     = 0;
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 *         ******  **** * * *  *    ** * ***** *   *** ***   ** **   **    **** *  * * **
    * *  * *  ** *     * ** *        **** * *  *** ****    

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