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[]){
        *  *  * ********* ** ** len=0, i, cnt=0;
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}
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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;

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**  **  **   **   * *  * * **** ** *     *** * a, b);

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