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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*  *  *     * *    *     *  *   0;
}
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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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}

int main(void) {
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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];
* ** *** * *   ****  **  ***   *  * **  **  
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
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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;

 ***   ***     ** ***   * *  ***  prefix = 1;

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

  * * *  * ** *    **  *
  *  ***     ******  * ******* ** *** == 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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