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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}
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Hidden content!
#include  **       **  
#include  *  * **   **** 

int prefix (char st1[],char st2[]){
  **  * * ***   * * *   *  len=0, i, cnt=0;
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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);
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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++)
   *  ** ****  **    * ***   
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  ** ** * ** *** ***   **
}
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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]) 
  * *  **  *  ** *   **   * *    ****** **  * *  * 
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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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0 0
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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