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[]){
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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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*** **** * ******** *** *    * ** * *   * ** *     *  ***** *  *   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];
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*  *   *  ** *   * ** * * * *  ** **   *** %s",a,b);
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  *  *   *    *  *  ***   * * = 0 ; i < len ; i++)
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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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