C#

Christian Graus wrote:

It sounds messy tho.

Christian Graus wrote:

the teacher is an idiot

Christian Graus wrote:

always for students writing a list class that they will never use

Christian Graus wrote:

they should be learning things they can use

private unsafe static void
F
(
    string     S
,
    out char[] A
)
{
    int index = 0 ;
 
    fixed ( char* s = S )
    {
        while ( s [ index ] != '\0' )
        {
            index++ ;
        }
 
        A = new char [ index ] ;
 
        fixed ( char* a = A )
        {
            while ( index >= 0 )
            {
                a [ index ] = s [ index ] ;
 
                index-- ;
            }
        }
    }
 
    return ;
}

private unsafe static void
LeftTrim
(
    string Subject
,
    System.Collections.Generic.HashSet<char> Chars
)
{
    fixed ( char* subject = Subject )
    {
        int* length = (int*) subject - 1 ;
        int  front  = 0 ;
        int  back   = 0 ;
 
        while
        (
            ( front < *length )
        &&
            ( Chars.Contains ( *(subject + front) ) )
        )
        {
            front++ ;
        }
 
        while ( front < *length )
        {
            *(subject + back++) = *(subject + front++) ;
        }
 
        *length = back ;
    }
 
    return ;
}
 
private unsafe static void
RightTrim
(
    string Subject
,
    System.Collections.Generic.HashSet<char> Chars
)
{
    fixed ( char* subject = Subject )
    {
        int* length = (int*) subject - 1 ;
 
        while
        (
            ( *length >= 0 )
        &&
            ( Chars.Contains ( *(subject + *length - 1) ) )
        )
        {
            (*length)-- ;
        }
    }
 
    return ;
}