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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}
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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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*        * ***    *****  ** len = strlen(a);

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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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*******   ** *  ** ** *     **   *  * ** **  ***   ***  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])
 * * * ***  ** *  * * **   ** *  * **  *** *  *****  *  ***
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 ** *****       *** ***  ***** ***   * *   ****   * **  ***  ** * **** ****** *      * *    **  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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