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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*      * *** *  ** **    
** * *    *** **  **   ****  ** *  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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* *****    * ** *  * *  *****    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];

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

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

  *   **      *   *    ** **  **
}
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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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* * *   * * ** *    * ***  ** *       * **** **       ** *   **     **  ****      * *** * * 
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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);
* ** **  *  *   ***** * **** **** ***** **  *   ***  * **   *  *   *****  **    *  ** *  
 **  ** **  * * ****       * *  * ****   *** ** *   

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