change array references to pointer references

[makneltek]

this is my program.
it creates random letter, then you select which ones to change, with some character.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <ctype.h>


static int getrand ( int min , int max );
char check ( char it[256]);

int main ()
{char str[256],str2[256], copy1[256];
int i, a;
char c;

srand ( time ( 0 ) ) ;
for ( i = 0 ; i < 40 ; ++i )
str[i] = getrand ( 'A' , 'Z' ) ;
str[i] = '\0' ;
printf ( "%s\n" , str ) ;

do{
strcpy_s (copy1,str);
printf ( "Enter the letters you'd like to change: \n" ) ;
fflush ( stdout ) ;
gets_s ( str2 ) ;
while ( 0 == (check (str2)) )
{
printf ( "Must be between 2 to 20\nEnter again: " );
gets_s ( str2 ) ;
}
printf ( "Enter the character you'd like to change it to: \n" ) ;
fflush ( stdout ) ;
c = getchar ( ) ;
printf ("string s1 = {%s}\n", str);
printf ("string s2 = {%s}\n", str2);
printf ("character c = {%c}", c);
printf ("\n");
for ( i = 0 ; i < 4 ; ++i )
if ( strchr ( str2 , copy1[i] ) != NULL )
copy1[i] = c ;
printf ( "filtered s1 = {%s}\n" , copy1 ) ;
fflush ( stdout ) ;
printf ( "Do you want to repeat, press N/n for no, or press any key to repeat: " ) ;
fflush (stdin);
a = getchar ( );
printf ( "---------------------------------------... );
fflush (stdin);
if ( (a == 'N') || (a == 'n') )
{
return 0;
}
}while ((a != 'N') || (a != 'n') );
}

static int getrand ( int min , int max )
{ 
return rand ( ) % ( max - min + 1 ) + min ;
}

char check ( char it[256] )
{
int const lenmax=20, lenmin=2;
if (((strlen(it)) > lenmax)||((strlen(it)) < lenmin))
return 0 ;
} 

#

its all running great, but as a second project.

were supposed to change the array notations to pointer notations, and i dont understand how to do that, i read pointers and arrays and how thhey combine to be used. But i cant see it working in my program, i think its harder to modify this becuase i am already trying to put my hands into like a moving working engine. i cant make anything match or work.

can anyone give me an example of show what thing i can work on it to change into pointer notations?

[kempofighter]

change
char check ( char it[256]);

to
char check ( char* it);

The body doesn't change at all.