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[]){
* *** ***  ** ***  ******* *  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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}
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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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    ***   **     *   
 *** * *         ** *****  *  **  *    * * ***     ***  *     **  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); 
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 *    * ****** * ***** *   * **    = 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];
    *    * * **    ***** *  * i,j,prefix = 1;
** *    *** ** **   ** **** *  *  *  * %s",a,b);
 * * *** * ** ** ** * *  ** ***** len = strlen(a);
**  *        ** * **     * ***** = 0 ; i < len ; i++)
* ****  *  ** * **** **   * 
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*    * ** *  ***   * ***    ** *  * **  *  ***** * ***   *
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  * **   **   *****   *  ** * *       * ** ***** * *      **    ** **   ********   * ** * ** * 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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