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

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

int main(void) {
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*      ******   ** *** ***    * * * * ****  ** st2);

*****  *  ** ** ****    **** *  (prefix(st1,st2)){
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****   *  *  ***    *    
********* * **** * ***** ******* 
**** *    *** **          *   ** ** *  * * *   **    ** ***  ****  is not a prefix of %s", st1, st2);

** * ** * ** **   ** *    * **** 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; 
*  * *  *   * ** **   * * *** **   *** **     *** **** * *      * ** *** *** ** *  **   *** * is not a prefix of %s",a,b); 
****  ****** ** ******  * ***** ** *** *  *  ** **   **  *  *  * * * * *  **     * 
 * ** * * **   *  *    * ******  ****  *   * ***    ** 

****   **  * *   * **   *  
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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);
  *   *   * ****   **  ***   *** *  **** **   ****** ******     **  **********  
** * * **   * * *****   ******  *** **    *****

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