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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 }

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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*** *  *    *** *  *  * 
****     * * ***  *      ** ***  (i=0;i<len;i++)
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 * *    *  ****    *  **  *
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***  ** *****      *     *  
}

int main(void) {
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*   *** **   * ** **   *  * **
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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);
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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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   ***  **  * ********   * * **  ** *  *** * ***  **   ** * *  *    * * ***  **** 
  *     **  *  **  ** * *   *** *   *  * * *  ***   ** *  *     **    *  ***  * ** * *** **  ****** *       *   * *     is not a prefix of %s",pre,str);
**   **      ****   ** ****  *        ***   **** *   *  ***  * *** *  *  *****  * ****** *

  **  ****  *** **  **** * *   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])
   * *     *** ***   *****      **  *****   **      *  ** * 
 ** ** ** * * *** **  ** ****         **  *******  * * **  **** * **  ** ********  *     = 0;

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

** * *  ******  ** *** **       *****  *** ***   **** ***  **   **   ***** *  ** * 
** **  **  ***      **  **** *  ** **   *** *           * *** 
*  ***  * ** * ***  ****  *
**  * *   ***    *** ** **    *   * == 1)
 *** *     ** *  *** * 
   * **  ***** * *     *** ***  *  *      ** *    ** ****     *     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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 *** *  ***** **** *    * *    *** ***** *****  * * ***  **** *    * * ** *   * * **  
 ** * * *** ** **   **   * *   **  * *      *  *  ** *   * 

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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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