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;
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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];

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**  * * * ** * *  ** **      * = 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; 
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***  *    *   *  *  ****    * *  = 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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 ***   *   ***   * **  **** ***    ** *******  ** **

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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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