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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}

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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];
 * ** *** * *  * **** * *  ******** ***      
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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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*  * **** * **  ** *  ** *** len = strlen(a);

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