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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int main(void)
{
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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];

** * **  *    *** * ********   i = 0;

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 * * *  *** ** * * *   *  *  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++)
 * *   ** ** ** **** *** **   * 
   ** ** ** * ****  ** ** * **** *****   *** ** *** **  *   != b[i])
  *  * *   * *  *** **  **  *   **  *  ******* **    *  **
 **  ***      ** *  **   ** **    *** *** *     * ***** **** **** **   *** * *  * = 0;
 ***   * ** ***     ** *** *  *     *      *   * ** **    ** ** ***  ** **     ********     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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